diff --git a/engines/__init__.py b/engines/__init__.py
index ae44aef..a48457e 100644
--- a/engines/__init__.py
+++ b/engines/__init__.py
@@ -1,5 +1,6 @@
 from .google import (
-    GoogleFreeTranslate, GoogleBasicTranslate, GoogleAdvancedTranslate)
+    GoogleFreeTranslate, GoogleBasicTranslate, GoogleBasicTranslateADC,
+    GoogleAdvancedTranslate)
 from .chatgpt import ChatgptTranslate, AzureChatgptTranslate
 from .deepl import DeeplTranslate, DeeplProTranslate, DeeplFreeTranslate
 from .youdao import YoudaoTranslate
@@ -8,7 +9,7 @@
 
 
 builtin_engines = (
-    GoogleFreeTranslate, GoogleBasicTranslate, GoogleAdvancedTranslate,
-    ChatgptTranslate, AzureChatgptTranslate, DeeplTranslate, DeeplProTranslate,
-    DeeplFreeTranslate, MicrosoftEdgeTranslate, YoudaoTranslate,
-    BaiduTranslate)
+    GoogleFreeTranslate, GoogleBasicTranslate, GoogleBasicTranslateADC,
+    GoogleAdvancedTranslate, ChatgptTranslate, AzureChatgptTranslate,
+    DeeplTranslate, DeeplProTranslate, DeeplFreeTranslate,
+    MicrosoftEdgeTranslate, YoudaoTranslate, BaiduTranslate)
diff --git a/engines/base.py b/engines/base.py
index ca22578..a31e6cd 100644
--- a/engines/base.py
+++ b/engines/base.py
@@ -1,4 +1,5 @@
 import ssl
+import os.path
 import traceback
 
 from mechanize import Browser, Request
@@ -21,6 +22,7 @@ class Base:
     api_key_errors = ['401']
     separator = '\n\n'
     placeholder = ('{{{{id_{}}}}}', r'({{\s*)+id\s*_\s*{}\s*(\s*}})+')
+    using_tip = None
 
     concurrency_limit = 0
     request_interval = 0.0
@@ -32,6 +34,7 @@ def __init__(self):
         self.source_lang = None
         self.target_lang = None
         self.proxy_uri = None
+        self.search_paths = []
 
         self.merge_enabled = False
 
@@ -108,6 +111,17 @@ def need_change_api_key(self, error_message):
                     return True
         return False
 
+    def set_search_paths(self, paths):
+        self.search_paths = paths
+
+    def get_external_program(self, name, paths=[]):
+        for path in paths + self.search_paths:
+            if not path.endswith('%s%s' % (os.path.sep, name)):
+                path = os.path.join(path, name)
+            if os.path.isfile(path):
+                return path
+        return None
+
     def set_endpoint(self, endpoint):
         self.endpoint = endpoint
 
diff --git a/engines/google.py b/engines/google.py
index 1074736..870118e 100644
--- a/engines/google.py
+++ b/engines/google.py
@@ -1,8 +1,10 @@
 import re
 import os
+import sys
 import time
 import json
 import os.path
+import traceback
 from subprocess import Popen, PIPE
 
 from ..lib.exception import BadApiKeyFormat
@@ -53,39 +55,117 @@ def _parse(self, data):
 
 
 class GoogleTranslate:
-    def _get_credential(self, key_file_path):
-        """Default lifetime of api key is 3600 seconds."""
+    api_key_errors = ['429']
+    api_key_cache = []
+    gcloud = None
+    project_id = None
+    using_tip = _(
+        'This plugin uses Application Default Credentials (ADC) in your local '
+        'environment to access your Google Translate service. To set up the '
+        'ADC, follow these steps:\n'
+        '1. Install the gcloud CLI by checking out its instructions {}.\n'
+        '2. Run the command: gcloud auth application-default login.\n'
+        '3. Sign in to your Google account and grant needed privileges.') \
+        .format('<sup><a href="https://cloud.google.com/sdk/docs/install">[^]'
+                '</a></sup>').replace('\n', '<br />')
+
+    def _run_command(self, command, silence=False):
+        message = _('Cannot run the command "{}".')
+        try:
+            startupinfo = None
+            # Prevent the popping console window on Windows.
+            if sys.platform == 'win32':
+                from subprocess import STARTUPINFO, STARTF_USESHOWWINDOW
+                startupinfo = STARTUPINFO()
+                startupinfo.dwFlags |= STARTF_USESHOWWINDOW
+            process = Popen(
+                command, stdout=PIPE, stderr=PIPE, universal_newlines=True,
+                startupinfo=startupinfo)
+        except Exception:
+            if silence:
+                return None
+            raise Exception(
+                message.format(command, '\n\n%s' % traceback.format_exc()))
+        if process.wait() != 0:
+            if silence:
+                return None
+            raise Exception(
+                message.format(command, '\n\n%s' % process.stderr.read()))
+        return process.stdout.read().strip()
+
+    def _get_gcloud_command(self):
+        if self.gcloud is not None:
+            return self.gcloud
+        if sys.platform == 'win32':
+            name = 'gcloud.cmd'
+            which = 'where'
+            base = r'google-cloud-sdk\bin\%s' % name
+            paths = [
+                r'"%s\Google\Cloud SDK\%s"'
+                % (os.environ.get('programfiles(x86)'), base),
+                r'"%s\AppData\Local\Google\Cloud SDK\%s"'
+                % (os.environ.get('userprofile'), base)]
+        else:
+            name = 'gcloud'
+            which = 'which'
+            paths = ['/usr/local/bin/%s' % name]
+        gcloud = self.get_external_program(name, paths)
+        if gcloud is None:
+            gcloud = self._run_command([which, name], silence=True)
+            if gcloud is not None:
+                gcloud = gcloud.split('\n')[0]
+        if gcloud is None:
+            raise Exception(_('Cannot find the command "{}".').format(name))
+        self.gcloud = gcloud
+        return gcloud
+
+    def _get_project_id(self):
+        if self.project_id is not None:
+            return self.project_id
+        self.project_id = self._run_command(
+            [self._get_gcloud_command(), 'config', 'get', 'project'])
+        return self.project_id
+
+    def _get_credential(self):
+        """The default lifetime of the API key is 3600 seconds. Once an
+        available key is generated, it will be cached until it expired.
+        """
         timestamp, old_api_key = self.api_key_cache or (None, None)
         if old_api_key is not None and time.time() - timestamp < 3600:
             return old_api_key
-        os.environ.update(GOOGLE_APPLICATION_CREDENTIALS=key_file_path)
+        # Temporarily add existing proxies.
         self.proxy_uri and os.environ.update(
             http_proxy=self.proxy_uri, https_proxy=self.proxy_uri)
-        process = Popen(
-            ['gcloud', 'auth', 'application-default', 'print-access-token'],
-            stdout=PIPE, stderr=PIPE)
-        if process.wait() != 0:
-            raise Exception(_('Can not obtain Google API key. Reason: {}')
-                            .format(process.stderr.read().decode('utf-8')))
+        new_api_key = self._run_command([
+            self._get_gcloud_command(), 'auth', 'application-default',
+            'print-access-token'])
+        # Cleanse the proxies after use.
         for proxy in ('http_proxy', 'https_proxy'):
             if proxy in os.environ:
                 del os.environ[proxy]
-        new_api_key = process.stdout.read().decode('utf-8').strip()
         self.api_key_cache[:] = [time.time(), new_api_key]
         return new_api_key
 
 
-class GoogleBasicTranslate(Base, GoogleTranslate):
-    name = 'Google(Basic)'
-    alias = 'Google (Basic)'
+class GoogleBasicTranslateADC(GoogleTranslate, Base):
+    name = 'Google(Basic)ADC'
+    alias = 'Google (Basic) ADC'
     lang_codes = Base.load_lang_codes(google)
     endpoint = 'https://translation.googleapis.com/language/translate/v2'
-    api_key_hint = 'API key or KEY_PATH'
-    api_key_errors = ['429']
-    api_key_cache = []
+    api_key_hint = 'API key'
+    need_api_key = False
+
+    def get_headers(self):
+        return {
+            'Content-Type': 'application/json',
+            'Authorization': 'Bearer %s' % self._get_credential(),
+            'x-goog-user-project': self._get_project_id(),
+        }
+
+    def get_data(self, data):
+        return json.dumps(data)
 
     def translate(self, text):
-        headers = {'Content-Type': 'application/x-www-form-urlencoded'}
         data = {
             'format': 'html',
             'model': 'nmt',
@@ -93,50 +173,46 @@ def translate(self, text):
             'q': text
         }
 
-        if self.api_key:
-            if os.path.sep not in self.api_key:
-                data.update(key=self.api_key)
-            else:
-                api_key = self._get_credential(self.api_key)
-                headers = {
-                    'Content-Type': 'application/json',
-                    'Authorization': 'Bearer %s' % api_key
-                }
-                data = json.dumps(data)
-
         if not self._is_auto_lang():
             data.update(source=self._get_source_code())
-
         return self.get_result(
-            self.endpoint, data, headers, method='POST', callback=self._parse)
+            self.endpoint, self.get_data(data), self.get_headers(),
+            method='POST', callback=self._parse)
 
     def _parse(self, data):
         translations = json.loads(data)['data']['translations']
         return ''.join(i['translatedText'] for i in translations)
 
 
-class GoogleAdvancedTranslate(Base, GoogleTranslate):
+class GoogleBasicTranslate(GoogleBasicTranslateADC):
+    name = 'Google(Basic)'
+    alias = 'Google (Basic)'
+    need_api_key = True
+    using_tip = None
+
+    def get_headers(self):
+        return {'Content-Type': 'application/x-www-form-urlencoded'}
+
+    def get_data(self, data):
+        data.update(key=self.api_key)
+        return data
+
+
+class GoogleAdvancedTranslate(GoogleTranslate, Base):
     name = 'Google(Advanced)'
-    alias = 'Google (Advanced)'
+    alias = 'Google (Advanced) ADC'
     lang_codes = Base.load_lang_codes(google)
     endpoint = 'https://translation.googleapis.com/v3/projects/{}'
-    api_key_hint = 'PROJECT_NUMBER_OR_ID|KEY_PATH'
-    api_key_pattern = r'^[^\s\|]+?\|.+$'
-    api_key_errors = ['429']
-    api_key_cache = []
+    api_key_hint = 'PROJECT_ID'
+    need_api_key = False
 
     def translate(self, text):
-        try:
-            project_id, key_file_path = re.split(r'\|', self.api_key)
-        except Exception:
-            raise BadApiKeyFormat(self.api_key_error_message())
-
+        project_id = self._get_project_id()
         endpoint = self.endpoint.format('%s:translateText' % project_id)
-        api_key = self._get_credential(key_file_path)
-
         headers = {
             'Content-Type': 'application/json',
-            'Authorization': 'Bearer %s' % api_key
+            'Authorization': 'Bearer %s' % self._get_credential(),
+            'x-goog-user-project': project_id,
         }
 
         data = {
diff --git a/lib/config.py b/lib/config.py
index 9cd111b..7c6faa5 100644
--- a/lib/config.py
+++ b/lib/config.py
@@ -28,6 +28,7 @@
     'merge_enabled': False,
     'merge_length': 1800,
     'ebook_metadata': {},
+    'search_paths': [],
 }
 
 
diff --git a/lib/translation.py b/lib/translation.py
index 8f770ef..fa39753 100644
--- a/lib/translation.py
+++ b/lib/translation.py
@@ -276,6 +276,7 @@ def get_translator(engine_class=None):
     config = get_config()
     engine_class = engine_class or get_engine_class()
     translator = engine_class()
+    translator.set_search_paths(config.get('search_paths'))
     if config.get('proxy_enabled'):
         translator.set_proxy(config.get('proxy_setting'))
     translator.set_merge_enabled(config.get('merge_enabled'))
diff --git a/setting.py b/setting.py
index 52653f5..16d0540 100644
--- a/setting.py
+++ b/setting.py
@@ -291,6 +291,20 @@ def change_input_format(format):
         log_translation.toggled.connect(
             lambda checked: self.config.update(log_translation=checked))
 
+        # Search path
+        path_group = QGroupBox(_('Search Paths'))
+        path_layout = QVBoxLayout(path_group)
+        path_desc = QLabel(
+            _('The plugin will search for external programs via these paths.'))
+        self.path_list = QPlainTextEdit()
+        self.path_list.setMinimumHeight(100)
+        path_layout.addWidget(path_desc)
+        path_layout.addWidget(self.path_list)
+
+        self.path_list.setPlainText('\n'.join(self.config.get('search_paths')))
+
+        layout.addWidget(path_group)
+
         layout.addStretch(1)
 
         return widget
@@ -311,6 +325,16 @@ def layout_engine(self):
         engine_layout.addWidget(manage_engine)
         layout.addWidget(engine_group)
 
+        # Using Tip
+        self.tip_group = QGroupBox(_('Using Tip'))
+        tip_layout = QVBoxLayout(self.tip_group)
+        self.using_tip = QLabel()
+        self.using_tip.setTextFormat(Qt.RichText)
+        self.using_tip.setWordWrap(True)
+        self.using_tip.setOpenExternalLinks(True)
+        tip_layout.addWidget(self.using_tip)
+        layout.addWidget(self.tip_group)
+
         # API Keys
         self.keys_group = QGroupBox(_('API Keys'))
         keys_layout = QVBoxLayout(self.keys_group)
@@ -467,7 +491,7 @@ def choose_default_engine(index):
             engine_name = engine_list.itemData(index)
             self.config.update(translate_engine=engine_name)
             self.current_engine = get_engine_class(engine_name)
-            # refresh preferred language
+            # Refresh preferred language
             source_lang = self.current_engine.config.get('source_lang')
             self.source_lang.refresh.emit(
                 self.current_engine.lang_codes.get('source'), source_lang,
@@ -475,7 +499,12 @@ def choose_default_engine(index):
             target_lang = self.current_engine.config.get('target_lang')
             self.target_lang.refresh.emit(
                 self.current_engine.lang_codes.get('target'), target_lang)
-            self.set_api_keys()  # show api key setting
+            # show use notice
+            show_tip = self.current_engine.using_tip is not None
+            self.tip_group.setVisible(show_tip)
+            show_tip and self.using_tip.setText(self.current_engine.using_tip)
+            # show api key setting
+            self.set_api_keys()
             # Request setting
             value = self.current_engine.config.get('concurrency_limit')
             if value is None:
@@ -538,6 +567,7 @@ def make_test_translator():
             if config is not None:
                 self.current_engine.set_config(config)
                 translator = self.current_engine()
+                translator.set_search_paths(self.get_search_paths())
                 self.proxy_enabled.isChecked() and translator.set_proxy(
                     [self.proxy_host.text(), self.proxy_port.text()])
                 EngineTester(self, translator)
@@ -551,10 +581,9 @@ def set_api_keys(self):
         need_api_key = self.current_engine.need_api_key
         self.keys_group.setVisible(need_api_key)
         if need_api_key:
-            self.api_keys.clear()
-            self.api_keys.setPlaceholderText(
-                self.current_engine.api_key_hint)
+            self.api_keys.setPlaceholderText(self.current_engine.api_key_hint)
             api_keys = self.current_engine.config.get('api_keys', [])
+            self.api_keys.clear()
             for api_key in api_keys:
                 self.api_keys.appendPlainText(api_key)
 
@@ -787,6 +816,10 @@ def is_valid_data(self, validator, value):
             return state == 2  # Compatible with PyQt5
         return state.value == 2
 
+    def get_search_paths(self):
+        path_list = self.path_list.toPlainText()
+        return [p for p in path_list.split('\n') if os.path.exists(p)]
+
     def update_general_config(self):
         # Output path
         if not self.config.get('to_library'):
@@ -813,6 +846,12 @@ def update_general_config(self):
             proxy_setting.append(int(port))
             self.config.update(proxy_setting=proxy_setting)
         len(proxy_setting) < 1 and self.config.delete('proxy_setting')
+
+        # Search paths
+        search_paths = self.get_search_paths()
+        self.config.update(search_paths=search_paths)
+        self.path_list.setPlainText('\n'.join(search_paths))
+
         return True
 
     def get_engine_config(self):
@@ -823,7 +862,7 @@ def get_engine_config(self):
             api_key_validator = QRegularExpressionValidator(
                 QRegularExpression(self.current_engine.api_key_pattern))
             key_str = re.sub('\n+', '\n', self.api_keys.toPlainText()).strip()
-            for key in [key.strip() for key in key_str.split('\n')]:
+            for key in [k.strip() for k in key_str.split('\n')]:
                 if not self.is_valid_data(api_key_validator, key):
                     self.alert.pop(
                         self.current_engine.api_key_error_message(), 'warning')
@@ -897,7 +936,7 @@ def update_content_config(self):
 
         # Filter rules
         rule_content = self.filter_rules.toPlainText()
-        filter_rules = [r for r in rule_content.split('\n') if r]
+        filter_rules = [r for r in rule_content.split('\n') if r.strip()]
         if self.config.get('rule_mode') == 'regex':
             for rule in filter_rules:
                 if not self.is_valid_regex(rule):
@@ -910,7 +949,7 @@ def update_content_config(self):
 
         # Element rules
         rule_content = self.element_rules.toPlainText()
-        element_rules = [r for r in rule_content.split('\n') if r]
+        element_rules = [r for r in rule_content.split('\n') if r.strip()]
         for rule in element_rules:
             if css(rule) is None:
                 self.alert.pop(
diff --git a/tests/test_config.py b/tests/test_config.py
index c6706eb..04a9e14 100644
--- a/tests/test_config.py
+++ b/tests/test_config.py
@@ -33,6 +33,7 @@ def test_default(self):
             'merge_enabled': False,
             'merge_length': 1800,
             'ebook_metadata': {},
+            'search_paths': [],
         }
 
         self.assertEqual(defaults, self.config.preferences.defaults)
diff --git a/tests/test_engine.py b/tests/test_engine.py
index e40bed0..809687f 100644
--- a/tests/test_engine.py
+++ b/tests/test_engine.py
@@ -16,7 +16,7 @@
 
 class TestBase(unittest.TestCase):
     def setUp(self):
-        self.mark, self.pattern = Base.placeholder
+        self.translator = Base()
 
     def test_placeholder(self):
         marks = [
@@ -24,7 +24,30 @@ def test_placeholder(self):
         for mark in marks:
             with self.subTest(mark=mark):
                 self.assertIsNotNone(
-                    re.search(self.pattern.format(1), 'xxx %s xxx' % mark))
+                    re.search(
+                        Base.placeholder[1].format(1),
+                        'xxx %s xxx' % mark))
+
+    @patch('calibre_plugins.ebook_translator.engines.base.os.path.isfile')
+    def test_get_external_program(self, mock_os_path_isfile):
+        mock_os_path_isfile.side_effect = lambda p: p in [
+            '/path/to/real', '/path/to/folder/real', '/path/to/specify/real']
+
+        self.translator.search_paths = ['/path/to/real']
+        self.assertEqual(
+            '/path/to/real',
+            self.translator.get_external_program('real'))
+
+        self.translator.search_paths = ['/path/to/folder']
+        self.assertEqual(
+            '/path/to/folder/real',
+            self.translator.get_external_program('real'))
+        self.assertEqual(
+            '/path/to/specify/real',
+            self.translator.get_external_program('real', ['/path/to/specify']))
+
+        self.assertIsNone(
+            self.translator.get_external_program('/path/to/fake'))
 
 
 @patch('calibre_plugins.ebook_translator.engines.base.Browser')
diff --git a/translations/es.mo b/translations/es.mo
index 10b76bb..7350abd 100644
Binary files a/translations/es.mo and b/translations/es.mo differ
diff --git a/translations/es.po b/translations/es.po
index 461145d..354c6dd 100644
--- a/translations/es.po
+++ b/translations/es.po
@@ -8,7 +8,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: Ebook Translator Calibre Plugin\n"
 "Report-Msgid-Bugs-To: bookfere@gmail.com\n"
-"POT-Creation-Date: 2023-09-29 21:24+0800\n"
+"POT-Creation-Date: 2023-11-14 02:37+0800\n"
 "PO-Revision-Date: 2023-04-17 14:17+0800\n"
 "Last-Translator: Automatically generated\n"
 "Language-Team: none\n"
@@ -333,8 +333,20 @@ msgstr "La respuesta fue analizada incorrectamente."
 msgid "{} total, {} used, {} left"
 msgstr "{} en total, {} utilizado(s), {} restante(s)"
 
-msgid "Can not obtain Google API key. Reason: {}"
-msgstr "No se puede obtener la clave de API de Google. Razón: {}"
+msgid ""
+"This plugin uses Application Default Credentials (ADC) in your local "
+"environment to access your Google Translate service. To set up the ADC, "
+"follow these steps:\n"
+"1. Install the gcloud CLI by checking out its instructions {}.\n"
+"2. Run the command: gcloud auth application-default login.\n"
+"3. Sign in to your Google account and grant needed privileges."
+msgstr ""
+
+msgid "Cannot run the command \"{}\"."
+msgstr ""
+
+msgid "Cannot find the command \"{}\"."
+msgstr ""
 
 msgid "Failed get APP key due to an invalid Token."
 msgstr ""
@@ -468,9 +480,18 @@ msgstr ""
 msgid "Show translation"
 msgstr "Mostrar traducción"
 
+msgid "Search Paths"
+msgstr ""
+
+msgid "The plugin will search for external programs via these paths."
+msgstr ""
+
 msgid "Custom"
 msgstr "Personalizado"
 
+msgid "Using Tip"
+msgstr ""
+
 msgid "Tip:"
 msgstr ""
 
diff --git a/translations/fr.mo b/translations/fr.mo
index ebde37c..7846700 100644
Binary files a/translations/fr.mo and b/translations/fr.mo differ
diff --git a/translations/fr.po b/translations/fr.po
index e8a2a7c..63596a3 100644
--- a/translations/fr.po
+++ b/translations/fr.po
@@ -4,7 +4,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: Ebook Translator Calibre Plugin\n"
 "Report-Msgid-Bugs-To: bookfere@gmail.com\n"
-"POT-Creation-Date: 2023-09-29 21:24+0800\n"
+"POT-Creation-Date: 2023-11-14 02:37+0800\n"
 "PO-Revision-Date: 2023-10-01 15:35-0400\n"
 "Last-Translator: <a href=\"https://www.mobileread.com/forums/member.php?"
 "u=90932\">PoP</a>\n"
@@ -341,8 +341,20 @@ msgstr "La réponse a été analysée incorrectement."
 msgid "{} total, {} used, {} left"
 msgstr "{} total, {} utilisé, {} restant"
 
-msgid "Can not obtain Google API key. Reason: {}"
-msgstr "Ne peut obtenir la clée d'API de Google. Raison: {}"
+msgid ""
+"This plugin uses Application Default Credentials (ADC) in your local "
+"environment to access your Google Translate service. To set up the ADC, "
+"follow these steps:\n"
+"1. Install the gcloud CLI by checking out its instructions {}.\n"
+"2. Run the command: gcloud auth application-default login.\n"
+"3. Sign in to your Google account and grant needed privileges."
+msgstr ""
+
+msgid "Cannot run the command \"{}\"."
+msgstr ""
+
+msgid "Cannot find the command \"{}\"."
+msgstr ""
 
 msgid "Failed get APP key due to an invalid Token."
 msgstr "Échoua l'obtention d'une clé APP à cause d'un Token non-valide."
@@ -477,9 +489,18 @@ msgstr "Registre de travail"
 msgid "Show translation"
 msgstr "Montrer la traduction"
 
+msgid "Search Paths"
+msgstr ""
+
+msgid "The plugin will search for external programs via these paths."
+msgstr ""
+
 msgid "Custom"
 msgstr "Personnalisé"
 
+msgid "Using Tip"
+msgstr ""
+
 msgid "Tip:"
 msgstr "Indice:"
 
diff --git a/translations/message.pot b/translations/message.pot
index 35c2d8b..32f752a 100644
--- a/translations/message.pot
+++ b/translations/message.pot
@@ -8,7 +8,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: Ebook Translator Calibre Plugin\n"
 "Report-Msgid-Bugs-To: bookfere@gmail.com\n"
-"POT-Creation-Date: 2023-09-29 21:24+0800\n"
+"POT-Creation-Date: 2023-11-14 02:37+0800\n"
 "PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
 "Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
 "Language-Team: LANGUAGE <LL@li.org>\n"
@@ -21,145 +21,145 @@ msgstr ""
 msgid "Ebook Translator"
 msgstr ""
 
-#: __init__.py:25
+#: __init__.py:26
 msgid ""
 "A Calibre plugin to translate ebook into a specified language (optionally "
 "keeping the original content)."
 msgstr ""
 
-#: advanced.py:89
+#: advanced.py:90
 msgid "Extracting ebook content..."
 msgstr ""
 
-#: advanced.py:98
+#: advanced.py:99
 msgid "Filtering ebook content..."
 msgstr ""
 
-#: advanced.py:107
+#: advanced.py:108
 msgid "Preparing user interface..."
 msgstr ""
 
-#: advanced.py:184
+#: advanced.py:185
 msgid "Start"
 msgstr ""
 
-#: advanced.py:198 batch.py:54 setting.py:176
+#: advanced.py:199 batch.py:54 setting.py:176
 msgid "Input Format"
 msgstr ""
 
-#: advanced.py:209 advanced.py:517 batch.py:55 setting.py:335
+#: advanced.py:210 advanced.py:516 batch.py:55 setting.py:359
 msgid "Target Language"
 msgstr ""
 
-#: advanced.py:305
+#: advanced.py:304
 msgid "Failed to translate {} paragraph(s), Would you like to retry?"
 msgstr ""
 
-#: advanced.py:311 lib/translation.py:250
+#: advanced.py:310 lib/translation.py:252
 msgid "Translation completed."
 msgstr ""
 
-#: advanced.py:326
+#: advanced.py:325
 msgid "There is no content that needs to be translated."
 msgstr ""
 
-#: advanced.py:363
+#: advanced.py:362
 msgid "Loading ebook data, please wait..."
 msgstr ""
 
-#: advanced.py:386
+#: advanced.py:385
 msgid "Review"
 msgstr ""
 
-#: advanced.py:387
+#: advanced.py:386
 msgid "Log"
 msgstr ""
 
-#: advanced.py:388
+#: advanced.py:387
 msgid "Errors"
 msgstr ""
 
-#: advanced.py:444
+#: advanced.py:443
 msgid "Translate All"
 msgstr ""
 
-#: advanced.py:445
+#: advanced.py:444
 msgid "Translate Selected"
 msgstr ""
 
-#: advanced.py:446 cache.py:92 components/engine.py:200 components/table.py:81
+#: advanced.py:445 cache.py:92 components/engine.py:200 components/table.py:81
 msgid "Delete"
 msgstr ""
 
-#: advanced.py:468 advanced.py:479
+#: advanced.py:467 advanced.py:478
 msgid "Stop"
 msgstr ""
 
-#: advanced.py:474
+#: advanced.py:473
 msgid "Stopping..."
 msgstr ""
 
-#: advanced.py:505 setting.py:304
+#: advanced.py:504 setting.py:318
 msgid "Translation Engine"
 msgstr ""
 
-#: advanced.py:511 batch.py:55 setting.py:334
+#: advanced.py:510 batch.py:55 setting.py:358
 msgid "Source Language"
 msgstr ""
 
-#: advanced.py:523
+#: advanced.py:522
 msgid "Cache Status"
 msgstr ""
 
-#: advanced.py:526
+#: advanced.py:525
 msgid "Disabled"
 msgstr ""
 
-#: advanced.py:526
+#: advanced.py:525
 msgid "Enabled"
 msgstr ""
 
-#: advanced.py:533
+#: advanced.py:532
 msgid "Output Ebook"
 msgstr ""
 
-#: advanced.py:535
+#: advanced.py:534
 msgid "Output"
 msgstr ""
 
-#: advanced.py:541 batch.py:54 cache.py:195
+#: advanced.py:540 batch.py:54 cache.py:195
 msgid "Title"
 msgstr ""
 
-#: advanced.py:585 components/table.py:70
+#: advanced.py:584 components/table.py:70
 msgid "Translated"
 msgstr ""
 
-#: advanced.py:618
+#: advanced.py:617
 msgid "No translation yet"
 msgstr ""
 
-#: advanced.py:665 components/engine.py:206 setting.py:88
+#: advanced.py:664 components/engine.py:206 setting.py:88
 msgid "Save"
 msgstr ""
 
-#: advanced.py:722
+#: advanced.py:723
 msgid "Your changes have been saved."
 msgstr ""
 
-#: advanced.py:735
+#: advanced.py:736
 msgid "Translation log"
 msgstr ""
 
-#: advanced.py:746
+#: advanced.py:747
 msgid "Error log"
 msgstr ""
 
-#: advanced.py:766
+#: advanced.py:767
 msgid "Are you sure you want to translate all {:n} paragraphs?"
 msgstr ""
 
-#: advanced.py:792
+#: advanced.py:793
 msgid "Are you sure you want to stop the translation progress?"
 msgstr ""
 
@@ -175,7 +175,7 @@ msgstr ""
 msgid "Unknown"
 msgstr ""
 
-#: batch.py:137 cache.py:130 setting.py:796
+#: batch.py:137 cache.py:130 setting.py:829
 msgid "The specified path does not exist."
 msgstr ""
 
@@ -184,7 +184,7 @@ msgid "Choose a path to store cache files."
 msgstr ""
 
 #: cache.py:73 components/mode.py:41 components/mode.py:51 setting.py:148
-#: setting.py:606 setting.py:640
+#: setting.py:635 setting.py:669
 msgid "Choose"
 msgstr ""
 
@@ -237,7 +237,7 @@ msgstr ""
 msgid "Engine"
 msgstr ""
 
-#: cache.py:195 components/table.py:36 setting.py:761
+#: cache.py:195 components/table.py:36 setting.py:790
 msgid "Language"
 msgstr ""
 
@@ -253,7 +253,8 @@ msgstr ""
 msgid "Size (MB)"
 msgstr ""
 
-#: components/engine.py:64 lib/translation.py:167
+#: components/engine.py:64 lib/translation.py:167 tests/test_translation.py:109
+#: tests/test_translation.py:129 tests/test_translation.py:142
 msgid "Translating..."
 msgstr ""
 
@@ -309,7 +310,7 @@ msgstr ""
 msgid "Feedback"
 msgstr ""
 
-#: components/lang.py:34 engines/base.py:65 setting.py:855
+#: components/lang.py:34 engines/base.py:70 setting.py:896
 msgid "Auto detect"
 msgstr ""
 
@@ -317,7 +318,7 @@ msgstr ""
 msgid "Choose a translation mode for clicking the icon button."
 msgstr ""
 
-#: components/mode.py:33 setting.py:105 ui.py:47 ui.py:75
+#: components/mode.py:33 setting.py:105 ui.py:54 ui.py:82
 msgid "Advanced Mode"
 msgstr ""
 
@@ -327,7 +328,7 @@ msgid ""
 "for more control and customization."
 msgstr ""
 
-#: components/mode.py:43 setting.py:106 ui.py:48 ui.py:102
+#: components/mode.py:43 setting.py:106 ui.py:55 ui.py:109
 msgid "Batch Mode"
 msgstr ""
 
@@ -365,76 +366,90 @@ msgstr ""
 msgid "Baidu"
 msgstr ""
 
-#: engines/base.py:18 setting.py:315
+#: engines/base.py:20 setting.py:339
 msgid "API Keys"
 msgstr ""
 
-#: engines/base.py:82
+#: engines/base.py:87
 msgid "A correct key format \"{}\" is required."
 msgstr ""
 
-#: engines/base.py:195 engines/chatgpt.py:104 tests/test_engine.py:63
+#: engines/base.py:214 engines/chatgpt.py:108 tests/test_engine.py:90
 msgid "Can not parse returned response. Raw data: {}"
 msgstr ""
 
-#: engines/custom.py:45 tests/test_custom.py:43
+#: engines/custom.py:45 tests/test_engine.py:236
 msgid "Engine data must be in valid JSON format."
 msgstr ""
 
-#: engines/custom.py:48 tests/test_custom.py:46
+#: engines/custom.py:48 tests/test_engine.py:239
 msgid "Invalid engine data."
 msgstr ""
 
-#: engines/custom.py:52 tests/test_custom.py:49
+#: engines/custom.py:52 tests/test_engine.py:242
 msgid "Engine name is required."
 msgstr ""
 
-#: engines/custom.py:55 tests/test_custom.py:53
+#: engines/custom.py:55 tests/test_engine.py:246
 msgid "Engine name must be different from builtin engine name."
 msgstr ""
 
-#: engines/custom.py:59 tests/test_custom.py:56 tests/test_custom.py:59
+#: engines/custom.py:59 tests/test_engine.py:249 tests/test_engine.py:252
 msgid "Language codes are required."
 msgstr ""
 
-#: engines/custom.py:63 tests/test_custom.py:62 tests/test_custom.py:65
+#: engines/custom.py:63 tests/test_engine.py:255 tests/test_engine.py:258
 msgid "Source and target must be added in pair."
 msgstr ""
 
-#: engines/custom.py:67 tests/test_custom.py:68
+#: engines/custom.py:67 tests/test_engine.py:261
 msgid "Request information is required."
 msgstr ""
 
-#: engines/custom.py:69 tests/test_custom.py:72
+#: engines/custom.py:69 tests/test_engine.py:265
 msgid "API URL is required."
 msgstr ""
 
-#: engines/custom.py:73 tests/test_custom.py:77
+#: engines/custom.py:73 tests/test_engine.py:270
 msgid "Placeholder <text> is required."
 msgstr ""
 
-#: engines/custom.py:77 tests/test_custom.py:82
+#: engines/custom.py:77 tests/test_engine.py:275
 msgid "Request headers must be an JSON object."
 msgstr ""
 
-#: engines/custom.py:80 tests/test_custom.py:88
+#: engines/custom.py:80 tests/test_engine.py:281
 msgid "A appropriate Content-Type in headers is required."
 msgstr ""
 
-#: engines/custom.py:84 tests/test_custom.py:93
+#: engines/custom.py:84 tests/test_engine.py:286
 msgid "Expression to parse response is required."
 msgstr ""
 
-#: engines/custom.py:133
+#: engines/custom.py:134
 msgid "Response was parsed incorrectly."
 msgstr ""
 
-#: engines/deepl.py:31 tests/test_engine.py:44
+#: engines/deepl.py:36 tests/test_engine.py:72
 msgid "{} total, {} used, {} left"
 msgstr ""
 
 #: engines/google.py:63
-msgid "Can not obtain Google API key. Reason: {}"
+msgid ""
+"This plugin uses Application Default Credentials (ADC) in your local "
+"environment to access your Google Translate service. To set up the ADC, "
+"follow these steps:\n"
+"1. Install the gcloud CLI by checking out its instructions {}.\n"
+"2. Run the command: gcloud auth application-default login.\n"
+"3. Sign in to your Google account and grant needed privileges."
+msgstr ""
+
+#: engines/google.py:73
+msgid "Cannot run the command \"{}\"."
+msgstr ""
+
+#: engines/google.py:118
+msgid "Cannot find the command \"{}\"."
 msgstr ""
 
 #: engines/microsoft.py:38
@@ -449,31 +464,31 @@ msgstr ""
 msgid "Youdao"
 msgstr ""
 
-#: lib/conversion.py:107
+#: lib/conversion.py:120
 msgid "Start to convert ebook format:"
 msgstr ""
 
-#: lib/conversion.py:143
+#: lib/conversion.py:156
 msgid "[{} > {}] Translating \"{}\""
 msgstr ""
 
-#: lib/conversion.py:152
+#: lib/conversion.py:165
 msgid "Translation job failed"
 msgstr ""
 
-#: lib/conversion.py:180
+#: lib/conversion.py:193
 msgid "completed"
 msgstr ""
 
-#: lib/conversion.py:188
+#: lib/conversion.py:201
 msgid "Ebook Translation Log"
 msgstr ""
 
-#: lib/conversion.py:189
+#: lib/conversion.py:202
 msgid "Translation Completed"
 msgstr ""
 
-#: lib/conversion.py:190
+#: lib/conversion.py:203
 msgid "The translation of \"{}\" was completed. Do you want to open the book?"
 msgstr ""
 
@@ -497,39 +512,39 @@ msgstr ""
 msgid "Translating: {}/{}"
 msgstr ""
 
-#: lib/translation.py:201 lib/translation.py:209
+#: lib/translation.py:203 lib/translation.py:211
 msgid "Original: {}"
 msgstr ""
 
-#: lib/translation.py:203
+#: lib/translation.py:205
 msgid "Translation: {}"
 msgstr ""
 
-#: lib/translation.py:205
+#: lib/translation.py:207
 msgid "Translation (Cached): {}"
 msgstr ""
 
-#: lib/translation.py:211
+#: lib/translation.py:213
 msgid "Error: {}"
 msgstr ""
 
-#: lib/translation.py:222
+#: lib/translation.py:224
 msgid "Start to translate ebook content"
 msgstr ""
 
-#: lib/translation.py:224
+#: lib/translation.py:226
 msgid "Total items: {}"
 msgstr ""
 
-#: lib/translation.py:225
+#: lib/translation.py:227
 msgid "Character count: {}"
 msgstr ""
 
-#: lib/translation.py:227
+#: lib/translation.py:229
 msgid "There is no content need to translate."
 msgstr ""
 
-#: lib/translation.py:247
+#: lib/translation.py:249
 msgid "Translation failed."
 msgstr ""
 
@@ -573,7 +588,7 @@ msgstr ""
 msgid "Merge to Translate"
 msgstr ""
 
-#: setting.py:198 setting.py:219 setting.py:263 setting.py:637
+#: setting.py:198 setting.py:219 setting.py:263 setting.py:666
 msgid "Enable"
 msgstr ""
 
@@ -593,11 +608,11 @@ msgstr ""
 msgid "Port"
 msgstr ""
 
-#: setting.py:245 setting.py:307
+#: setting.py:245 setting.py:321
 msgid "Test"
 msgstr ""
 
-#: setting.py:261 ui.py:50
+#: setting.py:261 ui.py:57
 msgid "Cache"
 msgstr ""
 
@@ -613,246 +628,258 @@ msgstr ""
 msgid "Show translation"
 msgstr ""
 
-#: setting.py:308
+#: setting.py:295
+msgid "Search Paths"
+msgstr ""
+
+#: setting.py:298
+msgid "The plugin will search for external programs via these paths."
+msgstr ""
+
+#: setting.py:322
 msgid "Custom"
 msgstr ""
 
-#: setting.py:319
+#: setting.py:329
+msgid "Using Tip"
+msgstr ""
+
+#: setting.py:343
 msgid "Tip:"
 msgstr ""
 
-#: setting.py:320
+#: setting.py:344
 msgid "API keys will auto-switch if the previous one is unavailable."
 msgstr ""
 
-#: setting.py:330
+#: setting.py:354
 msgid "Preferred Language"
 msgstr ""
 
-#: setting.py:341
+#: setting.py:365
 msgid "HTTP Request"
 msgstr ""
 
-#: setting.py:355
+#: setting.py:379
 msgid "Concurrency limit"
 msgstr ""
 
-#: setting.py:356
+#: setting.py:380
 msgid "Interval (seconds)"
 msgstr ""
 
-#: setting.py:357
+#: setting.py:381
 msgid "Attempt times"
 msgstr ""
 
-#: setting.py:358
+#: setting.py:382
 msgid "Timeout (seconds)"
 msgstr ""
 
-#: setting.py:360
+#: setting.py:384
 msgid "Error count to stop translation"
 msgstr ""
 
-#: setting.py:370
+#: setting.py:394
 msgid "Tune ChatGPT"
 msgstr ""
 
-#: setting.py:378
+#: setting.py:402
 msgid "Prompt"
 msgstr ""
 
-#: setting.py:380
+#: setting.py:404
 msgid "Endpoint"
 msgstr ""
 
-#: setting.py:383
+#: setting.py:407
 msgid "Model"
 msgstr ""
 
-#: setting.py:406
+#: setting.py:430
 msgid "Sampling"
 msgstr ""
 
-#: setting.py:411
+#: setting.py:435
 msgid "Enable streaming text like in ChatGPT"
 msgstr ""
 
-#: setting.py:412
+#: setting.py:436
 msgid "Stream"
 msgstr ""
 
-#: setting.py:567
+#: setting.py:596
 msgid "Translation Position"
 msgstr ""
 
-#: setting.py:569
+#: setting.py:598
 msgid "Add after original"
 msgstr ""
 
-#: setting.py:571
+#: setting.py:600
 msgid "Add before original"
 msgstr ""
 
-#: setting.py:572
+#: setting.py:601
 msgid "Add without original"
 msgstr ""
 
-#: setting.py:595
+#: setting.py:624
 msgid "Translation Color"
 msgstr ""
 
-#: setting.py:599
+#: setting.py:628
 msgid "CSS color value, e.g., #666666, grey, rgb(80, 80, 80)"
 msgstr ""
 
-#: setting.py:635
+#: setting.py:664
 msgid "Translation Glossary"
 msgstr ""
 
-#: setting.py:639
+#: setting.py:668
 msgid "Choose a glossary file"
 msgstr ""
 
-#: setting.py:658
+#: setting.py:687
 msgid "Ignore Paragraph"
 msgstr ""
 
-#: setting.py:664
+#: setting.py:693
 msgid "Scope"
 msgstr ""
 
-#: setting.py:665
+#: setting.py:694
 msgid "Text only"
 msgstr ""
 
-#: setting.py:667
+#: setting.py:696
 msgid "HTML element"
 msgstr ""
 
-#: setting.py:674
+#: setting.py:703
 msgid "Mode"
 msgstr ""
 
-#: setting.py:675
+#: setting.py:704
 msgid "Normal"
 msgstr ""
 
-#: setting.py:677
+#: setting.py:706
 msgid "Normal (case-sensitive)"
 msgstr ""
 
-#: setting.py:678
+#: setting.py:707
 msgid "Regular Expression"
 msgstr ""
 
-#: setting.py:720
+#: setting.py:749
 msgid "Exclude paragraph by keyword. One keyword per line:"
 msgstr ""
 
-#: setting.py:721
+#: setting.py:750
 msgid "Exclude paragraph by case-sensitive keyword. One keyword per line:"
 msgstr ""
 
-#: setting.py:723
+#: setting.py:752
 msgid "Exclude paragraph by regular expression pattern. One pattern per line:"
 msgstr ""
 
-#: setting.py:739
+#: setting.py:768
 msgid "Ignore Element"
 msgstr ""
 
-#: setting.py:747
+#: setting.py:776
 msgid "CSS selectors to exclude elements. One rule per line:"
 msgstr ""
 
-#: setting.py:750
+#: setting.py:779
 msgid "e.g."
 msgstr ""
 
-#: setting.py:754
+#: setting.py:783
 msgid "Ebook Metadata"
 msgstr ""
 
-#: setting.py:757
+#: setting.py:786
 msgid "Set \"Target Language\" to metadata"
 msgstr ""
 
-#: setting.py:760
+#: setting.py:789
 msgid "Subjects of ebook (one subject per line)"
 msgstr ""
 
-#: setting.py:762
+#: setting.py:791
 msgid "Subject"
 msgstr ""
 
-#: setting.py:779 setting.py:810
+#: setting.py:808 setting.py:843
 msgid "Proxy host or port is incorrect."
 msgstr ""
 
-#: setting.py:781
+#: setting.py:810
 msgid "The proxy is available."
 msgstr ""
 
-#: setting.py:782
+#: setting.py:811
 msgid "The proxy is not available."
 msgstr ""
 
-#: setting.py:840
+#: setting.py:879
 msgid "the prompt must include {}."
 msgstr ""
 
-#: setting.py:882
+#: setting.py:923
 msgid "Invalid color value."
 msgstr ""
 
-#: setting.py:891
+#: setting.py:932
 msgid "The specified glossary file does not exist."
 msgstr ""
 
-#: setting.py:903
+#: setting.py:944
 msgid "{} is not a valid regular expression."
 msgstr ""
 
-#: setting.py:915
+#: setting.py:956
 msgid "{} is not a valid CSS seletor."
 msgstr ""
 
-#: ui.py:32
+#: ui.py:38
 msgid "Translate Book"
 msgstr ""
 
-#: ui.py:32
+#: ui.py:38
 msgid "Translate Ebook Content"
 msgstr ""
 
-#: ui.py:51 ui.py:118
+#: ui.py:58 ui.py:125
 msgid "Setting"
 msgstr ""
 
-#: ui.py:52 ui.py:146
+#: ui.py:59 ui.py:153
 msgid "About"
 msgstr ""
 
-#: ui.py:83
+#: ui.py:90
 msgid "Please choose one single book."
 msgstr ""
 
-#: ui.py:96
+#: ui.py:103
 msgid "Please choose at least one book."
 msgstr ""
 
-#: ui.py:110
+#: ui.py:117
 msgid "Cannot change setting while book(s) are under translation."
 msgstr ""
 
-#: ui.py:126
+#: ui.py:133
 msgid "Cannot manage cache while book(s) are under translation."
 msgstr ""
 
-#: ui.py:135
+#: ui.py:142
 msgid "Cache Manager"
 msgstr ""
 
-#: ui.py:164
+#: ui.py:171
 msgid "Choose Translation Mode"
 msgstr ""
diff --git a/translations/zh_CN.mo b/translations/zh_CN.mo
index cfc2ca3..1fa930d 100644
Binary files a/translations/zh_CN.mo and b/translations/zh_CN.mo differ
diff --git a/translations/zh_CN.po b/translations/zh_CN.po
index 90397ad..4c92569 100644
--- a/translations/zh_CN.po
+++ b/translations/zh_CN.po
@@ -8,7 +8,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: Ebook Translator Calibre Plugin\n"
 "Report-Msgid-Bugs-To: bookfere@gmail.com\n"
-"POT-Creation-Date: 2023-09-29 21:24+0800\n"
+"POT-Creation-Date: 2023-11-14 02:37+0800\n"
 "PO-Revision-Date: 2023-04-17 14:17+0800\n"
 "Last-Translator: Automatically generated\n"
 "Language-Team: none\n"
@@ -330,8 +330,25 @@ msgstr "响应没有正确解析。"
 msgid "{} total, {} used, {} left"
 msgstr "总计 {}，已用 {}，剩余 {}"
 
-msgid "Can not obtain Google API key. Reason: {}"
-msgstr "无法获取 Google API 密钥。原因：{}"
+msgid ""
+"This plugin uses Application Default Credentials (ADC) in your local "
+"environment to access your Google Translate service. To set up the ADC, "
+"follow these steps:\n"
+"1. Install the gcloud CLI by checking out its instructions {}.\n"
+"2. Run the command: gcloud auth application-default login.\n"
+"3. Sign in to your Google account and grant needed privileges."
+msgstr ""
+"本插件使用你本机环境中的 Application Default Credentials (ADC) 来访问你的 "
+"Google Translate 服务。请参照以下步骤设置 ADC：\n"
+"1、参考 gcloud CLI 安装指南安装 gcloud {}。\n"
+"2、运行命令：gcloud auth application-default login。\n"
+"3、登录你的 Google 账号并准许必要的权限。"
+
+msgid "Cannot run the command \"{}\"."
+msgstr "无法运行命令 \"{}\"。"
+
+msgid "Cannot find the command \"{}\"."
+msgstr "找不到命令 \"{}\"。"
 
 msgid "Failed get APP key due to an invalid Token."
 msgstr "因错误的令牌导致 APP 密钥获取失败。"
@@ -465,9 +482,18 @@ msgstr "任务日志"
 msgid "Show translation"
 msgstr "显示译文"
 
+msgid "Search Paths"
+msgstr "搜索路径"
+
+msgid "The plugin will search for external programs via these paths."
+msgstr "本插件将会通过以下路径搜索外部程序。"
+
 msgid "Custom"
 msgstr "自定义"
 
+msgid "Using Tip"
+msgstr "使用提示"
+
 msgid "Tip:"
 msgstr "提示："
 
diff --git a/translations/zh_TW.mo b/translations/zh_TW.mo
index ec90f10..42833f0 100644
Binary files a/translations/zh_TW.mo and b/translations/zh_TW.mo differ
diff --git a/translations/zh_TW.po b/translations/zh_TW.po
index 9ecdafa..dbd2b5a 100644
--- a/translations/zh_TW.po
+++ b/translations/zh_TW.po
@@ -8,7 +8,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: Ebook Translator Calibre Plugin\n"
 "Report-Msgid-Bugs-To: bookfere@gmail.com\n"
-"POT-Creation-Date: 2023-09-29 21:24+0800\n"
+"POT-Creation-Date: 2023-11-14 02:37+0800\n"
 "PO-Revision-Date: 2023-04-25 15:36+0800\n"
 "Last-Translator: Automatically generated\n"
 "Language-Team: none\n"
@@ -331,8 +331,20 @@ msgstr "回應剖析不正確。"
 msgid "{} total, {} used, {} left"
 msgstr "總計 {}，已用 {}，剩餘 {}"
 
-msgid "Can not obtain Google API key. Reason: {}"
-msgstr "無法取得 Google API 金鑰。原因：{}"
+msgid ""
+"This plugin uses Application Default Credentials (ADC) in your local "
+"environment to access your Google Translate service. To set up the ADC, "
+"follow these steps:\n"
+"1. Install the gcloud CLI by checking out its instructions {}.\n"
+"2. Run the command: gcloud auth application-default login.\n"
+"3. Sign in to your Google account and grant needed privileges."
+msgstr ""
+
+msgid "Cannot run the command \"{}\"."
+msgstr ""
+
+msgid "Cannot find the command \"{}\"."
+msgstr ""
 
 msgid "Failed get APP key due to an invalid Token."
 msgstr ""
@@ -466,9 +478,18 @@ msgstr "工作記錄"
 msgid "Show translation"
 msgstr "顯示譯文"
 
+msgid "Search Paths"
+msgstr ""
+
+msgid "The plugin will search for external programs via these paths."
+msgstr ""
+
 msgid "Custom"
 msgstr "自訂"
 
+msgid "Using Tip"
+msgstr ""
+
 msgid "Tip:"
 msgstr ""