diff --git a/.github/workflows/macos.yml b/.github/workflows/macos.yml
index c1ba825..05f39f0 100644
--- a/.github/workflows/macos.yml
+++ b/.github/workflows/macos.yml
@@ -56,21 +56,6 @@ jobs:
     env:
       targetName: PolyChatTester
     steps:
-      # macos 11.0 默认环境变了,要指定
-      - name: prepare env
-        if: ${{ matrix.os == 'macos-11.0' }}
-        run: |
-          softwareupdate --all --install --force
-          sudo xcode-select --print-path
-          sudo xcode-select --switch /Library/Developer/CommandLineTools       
-      - name: Install Qt
-        uses: jurplel/install-qt-action@v3
-        with:
-          version: ${{ matrix.qt_ver }}
-          cached: 'false'
-      - uses: actions/checkout@v2
-        with:
-          fetch-depth: 1
       - name: Test on macOS 
         run: |
           cd ./Tester
diff --git a/App/db_localdata.h b/App/db_localdata.h
index 287c204..88e621f 100644
--- a/App/db_localdata.h
+++ b/App/db_localdata.h
@@ -7,16 +7,28 @@
 #include "uil_chatlist.h"
 #include "chat.h"
 
-static const qint16 PORT_TCP_FILE           = 8848;
+/**
+ * 在此修改配置
+ */
+static const qint16 PORT_TCP_FILE           = 8848;  // TCP 文件发送-接收端口
 static const qint16 PORT_CHAT_LIST          = 2903;
-static const unsigned int TCP_DELAY_MS      = 20;
+static const unsigned int TCP_DELAY_MS      = 20;    // TCP 文件发送间隔，防止黏包
 
+/**
+ * 群组聊天的端口号范围
+ */
 static const qint16 PORT_MIN                = 1;
 static const qint16 PORT_MAX                = 32767;
 
+/**
+ * TCP 能够传输的最大文件大小，单位为 Byte
+ */
 static const int    FILE_SEND_MAX_BYTES     = 1 * 1024 * 1024 * 1024;  // bytes
 
 
+/**
+ * 本机信息
+ */
 extern QString      localUserName;
 extern QString      localUserGroupNumber;
 extern QHostAddress localIpAddress      ;
diff --git a/App/tcpclient.cpp b/App/tcpclient.cpp
index 07d34e5..52d936b 100644
--- a/App/tcpclient.cpp
+++ b/App/tcpclient.cpp
@@ -33,13 +33,13 @@ TcpClient::TcpClient(QWidget *parent, QString fileName, qint64 fileSizeBytes, QH
 
     this->tcpSocket = new QTcpSocket(this);
     /* 如果与主机建立连接 */
-    connect(this->tcpSocket, &QTcpSocket::connected, [=](){
+    connect(this->tcpSocket, &QTcpSocket::connected, this, [=](){
         ui->btnSave->setEnabled(false);
         appendTextBrowser(Qt::green, "[INFO] Successfully establish a link with the host");
     });
 
     /* 如果与主机断开连接 */
-    connect(this->tcpSocket, &QTcpSocket::disconnected, [=](){
+    connect(this->tcpSocket, &QTcpSocket::disconnected, this, [=](){
         ui->btnSave->setEnabled(true);
         appendTextBrowser(Qt::darkYellow, "[WARNING] Disconnected with the host");
     });
@@ -63,7 +63,7 @@ TcpClient::TcpClient(QWidget *parent, QString fileName, qint64 fileSizeBytes, QH
     connect(ui->btnSave, &QPushButton::clicked, this, &TcpClient::connectTcpServerAndOpenFile);
 
     /* 点击 Cancel 按钮 */
-    connect(ui->btnCancel, &QPushButton::clicked, [=](){ this->close(); });
+    connect(ui->btnCancel, &QPushButton::clicked, this, [=](){ this->close(); });
 
     appendTextBrowser(Qt::blue, "[INFO] Initializing the TCP client done");
     appendTextBrowser(Qt::red, "[INFO] Click `Save` to receive the file");
diff --git a/App/tcpserver.cpp b/App/tcpserver.cpp
index d0f0adc..5872e86 100644
--- a/App/tcpserver.cpp
+++ b/App/tcpserver.cpp
@@ -102,7 +102,7 @@ TcpServer::TcpServer(QWidget *parent, QString filePath, QHostAddress ip, qint16
         if (len > 0)
         {
             appendTextBrowser(Qt::blue, "[INFO] The file header is sent successfully");
-            timer->start(TCP_DELAY_MS);
+            timer->start(TCP_DELAY_MS);  // TCP 文件发送间隔，防止黏包
             return;
         }
         else
@@ -198,7 +198,7 @@ void  TcpServer::closeEvent(QCloseEvent* event)
         event->ignore();
     }
 
-    /* 防止在未发送文件（tcpSocket 未初始化）的情况下关闭窗口出现的奔溃 */
+    /* 【注意】这里可以防止在未发送文件（tcpSocket 未初始化）的情况下关闭窗口出现的崩溃 */
     if (nullptr != this->tcpSocket)
     {
         tcpSocket->disconnectFromHost(); //断开连接