diff --git a/STranslate/Images/Button_Default/lock.png b/STranslate/Images/Button_Default/topmost.png
similarity index 100%
rename from STranslate/Images/Button_Default/lock.png
rename to STranslate/Images/Button_Default/topmost.png
diff --git a/STranslate/Images/Button_Default/unlock.png b/STranslate/Images/Button_Default/untopmost.png
similarity index 100%
rename from STranslate/Images/Button_Default/unlock.png
rename to STranslate/Images/Button_Default/untopmost.png
diff --git a/STranslate/MainWindow.xaml.cs b/STranslate/MainWindow.xaml.cs
index 6b98f57..335b73b 100644
--- a/STranslate/MainWindow.xaml.cs
+++ b/STranslate/MainWindow.xaml.cs
@@ -101,7 +101,7 @@ namespace STranslate
                 this.Hide();
 
                 //取消置顶
-                vm.TopImgSource = UnLockImgPath;
+                vm.TopImgSource = _UnTopmost;
             }
             //置顶 Ctrl+Shift+T
             if (e.KeyboardDevice.Modifiers.HasFlag(ModifierKeys.Control)
@@ -174,7 +174,7 @@ namespace STranslate
         /// <param name="e"></param>
         private void Window_Deactivated(object sender, EventArgs e)
         {
-            if (vm.TopImgSource == UnLockImgPath)
+            if (vm.TopImgSource == _UnTopmost)
             {
                 this.Hide();
             }
@@ -259,7 +259,7 @@ namespace STranslate
         /// <param name="e"></param>
         private void Top_Click(object sender, RoutedEventArgs e)
         {
-            vm.TopImgSource = vm.TopImgSource == LockImgPath ? UnLockImgPath : LockImgPath;
+            vm.TopImgSource = vm.TopImgSource == _Topmost ? _UnTopmost : _Topmost;
         }
         /// <summary>
         /// 退出
@@ -274,13 +274,13 @@ namespace STranslate
         }
         private void InitView()
         {
-            vm.TopImgSource = UnLockImgPath;
+            vm.TopImgSource = _UnTopmost;
 
             this.Activate();
             this.TextBoxInput.Focus();
         }
-        private BitmapImage LockImgPath = new BitmapImage(new Uri("pack://application:,,,/STranslate;component/Images/Button_Default/lock.png"));
-        private BitmapImage UnLockImgPath = new BitmapImage(new Uri("pack://application:,,,/STranslate;component/Images/Button_Default/unlock.png"));
+        private static readonly BitmapImage _Topmost = new BitmapImage(new Uri("pack://application:,,,/STranslate;component/Images/Button_Default/topmost.png"));
+        private static readonly BitmapImage _UnTopmost = new BitmapImage(new Uri("pack://application:,,,/STranslate;component/Images/Button_Default/untopmost.png"));
         private System.Windows.Forms.NotifyIcon notifyIcon = new System.Windows.Forms.NotifyIcon();
     }
 }
\ No newline at end of file
diff --git a/STranslate/Properties/Resources.Designer.cs b/STranslate/Properties/Resources.Designer.cs
index e0d0fe9..d1d0166 100644
--- a/STranslate/Properties/Resources.Designer.cs
+++ b/STranslate/Properties/Resources.Designer.cs
@@ -60,16 +60,6 @@ namespace STranslate.Properties {
             }
         }
         
-        /// <summary>
-        ///   查找 System.Drawing.Bitmap 类型的本地化资源。
-        /// </summary>
-        internal static System.Drawing.Bitmap _lock {
-            get {
-                object obj = ResourceManager.GetObject("_lock", resourceCulture);
-                return ((System.Drawing.Bitmap)(obj));
-            }
-        }
-        
         /// <summary>
         ///   查找 System.Drawing.Bitmap 类型的本地化资源。
         /// </summary>
@@ -140,6 +130,16 @@ namespace STranslate.Properties {
             }
         }
         
+        /// <summary>
+        ///   查找 System.Drawing.Bitmap 类型的本地化资源。
+        /// </summary>
+        internal static System.Drawing.Bitmap topmost {
+            get {
+                object obj = ResourceManager.GetObject("topmost", resourceCulture);
+                return ((System.Drawing.Bitmap)(obj));
+            }
+        }
+        
         /// <summary>
         ///   查找类似于 (图标) 的 System.Drawing.Icon 类型的本地化资源。
         /// </summary>
@@ -153,9 +153,9 @@ namespace STranslate.Properties {
         /// <summary>
         ///   查找 System.Drawing.Bitmap 类型的本地化资源。
         /// </summary>
-        internal static System.Drawing.Bitmap unlock {
+        internal static System.Drawing.Bitmap untopmost {
             get {
-                object obj = ResourceManager.GetObject("unlock", resourceCulture);
+                object obj = ResourceManager.GetObject("untopmost", resourceCulture);
                 return ((System.Drawing.Bitmap)(obj));
             }
         }
diff --git a/STranslate/Properties/Resources.resx b/STranslate/Properties/Resources.resx
index 4d0554b..a67d5b1 100644
--- a/STranslate/Properties/Resources.resx
+++ b/STranslate/Properties/Resources.resx
@@ -139,16 +139,16 @@
   <data name="screenshot" type="System.Resources.ResXFileRef, System.Windows.Forms">
     <value>..\images\tray\screenshot.ico;System.Drawing.Icon, System.Drawing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a</value>
   </data>
+  <data name="topmost" type="System.Resources.ResXFileRef, System.Windows.Forms">
+    <value>..\images\button_default\topmost.png;System.Drawing.Bitmap, System.Drawing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a</value>
+  </data>
   <data name="translate" type="System.Resources.ResXFileRef, System.Windows.Forms">
     <value>..\images\translate.ico;System.Drawing.Icon, System.Drawing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a</value>
   </data>
-  <data name="unlock" type="System.Resources.ResXFileRef, System.Windows.Forms">
-    <value>..\images\button_default\unlock.png;System.Drawing.Bitmap, System.Drawing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a</value>
+  <data name="untopmost" type="System.Resources.ResXFileRef, System.Windows.Forms">
+    <value>..\images\button_default\untopmost.png;System.Drawing.Bitmap, System.Drawing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a</value>
   </data>
   <data name="window" type="System.Resources.ResXFileRef, System.Windows.Forms">
     <value>..\images\tray\window.ico;System.Drawing.Icon, System.Drawing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a</value>
   </data>
-  <data name="_lock" type="System.Resources.ResXFileRef, System.Windows.Forms">
-    <value>..\images\button_default\lock.png;System.Drawing.Bitmap, System.Drawing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a</value>
-  </data>
 </root>
\ No newline at end of file
diff --git a/STranslate/STranslate.csproj b/STranslate/STranslate.csproj
index 6cc0289..551891a 100644
--- a/STranslate/STranslate.csproj
+++ b/STranslate/STranslate.csproj
@@ -153,10 +153,10 @@
     <Resource Include="Images\Tray\window.ico">
       <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
     </Resource>
-    <Resource Include="Images\Button_Default\unlock.png">
+    <Resource Include="Images\Button_Default\untopmost.png">
       <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
     </Resource>
-    <Resource Include="Images\Button_Default\lock.png">
+    <Resource Include="Images\Button_Default\topmost.png">
       <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
     </Resource>
     <Resource Include="Images\translate.ico">