diff --git a/app/src/main/java/net/micode/notes/gtask/data/Node.java b/app/src/main/java/net/micode/notes/gtask/data/Node.java
index 63950e0..4685727 100644
--- a/app/src/main/java/net/micode/notes/gtask/data/Node.java
+++ b/app/src/main/java/net/micode/notes/gtask/data/Node.java
@@ -20,33 +20,29 @@ import android.database.Cursor;
 
 import org.json.JSONObject;
 
+/**
+ * 同步节点抽象类，定义了GTask同步操作的基本属性和方法
+ * 所有同步节点类都应继承自该类
+ */
 public abstract class Node {
-    public static final int SYNC_ACTION_NONE = 0;
-
-    public static final int SYNC_ACTION_ADD_REMOTE = 1;
-
-    public static final int SYNC_ACTION_ADD_LOCAL = 2;
-
-    public static final int SYNC_ACTION_DEL_REMOTE = 3;
-
-    public static final int SYNC_ACTION_DEL_LOCAL = 4;
-
-    public static final int SYNC_ACTION_UPDATE_REMOTE = 5;
-
-    public static final int SYNC_ACTION_UPDATE_LOCAL = 6;
-
-    public static final int SYNC_ACTION_UPDATE_CONFLICT = 7;
-
-    public static final int SYNC_ACTION_ERROR = 8;
-
-    private String mGid;
-
-    private String mName;
-
-    private long mLastModified;
-
-    private boolean mDeleted;
-
+    // 同步操作类型常量
+    public static final int SYNC_ACTION_NONE = 0;            // 无操作
+    public static final int SYNC_ACTION_ADD_REMOTE = 1;      // 远程添加
+    public static final int SYNC_ACTION_ADD_LOCAL = 2;       // 本地添加
+    public static final int SYNC_ACTION_DEL_REMOTE = 3;      // 远程删除
+    public static final int SYNC_ACTION_DEL_LOCAL = 4;       // 本地删除
+    public static final int SYNC_ACTION_UPDATE_REMOTE = 5;    // 远程更新
+    public static final int SYNC_ACTION_UPDATE_LOCAL = 6;    // 本地更新
+    public static final int SYNC_ACTION_UPDATE_CONFLICT = 7;  // 更新冲突
+    public static final int SYNC_ACTION_ERROR = 8;           // 操作错误
+
+    // 节点基本属性
+    private String mGid;         // 全局唯一ID
+    private String mName;        // 节点名称
+    private long mLastModified;  // 最后修改时间
+    private boolean mDeleted;    // 删除标记
+
+    // 构造方法，初始化属性默认值
     public Node() {
         mGid = null;
         mName = "";
@@ -54,48 +50,61 @@ public abstract class Node {
         mDeleted = false;
     }
 
+    // 创建同步操作的JSON对象（由子类实现）
     public abstract JSONObject getCreateAction(int actionId);
 
+    // 更新同步操作的JSON对象（由子类实现）
     public abstract JSONObject getUpdateAction(int actionId);
 
+    // 从远程JSON设置内容（由子类实现）
     public abstract void setContentByRemoteJSON(JSONObject js);
 
+    // 从本地JSON设置内容（由子类实现）
     public abstract void setContentByLocalJSON(JSONObject js);
 
+    // 从内容获取本地JSON（由子类实现）
     public abstract JSONObject getLocalJSONFromContent();
 
+    // 获取同步操作类型（由子类实现）
     public abstract int getSyncAction(Cursor c);
 
+    // 设置全局ID
     public void setGid(String gid) {
         this.mGid = gid;
     }
 
+    // 设置节点名称
     public void setName(String name) {
         this.mName = name;
     }
 
+    // 设置最后修改时间
     public void setLastModified(long lastModified) {
         this.mLastModified = lastModified;
     }
 
+    // 设置删除标记
     public void setDeleted(boolean deleted) {
         this.mDeleted = deleted;
     }
 
+    // 获取全局ID
     public String getGid() {
         return this.mGid;
     }
 
+    // 获取节点名称
     public String getName() {
         return this.mName;
     }
 
+    // 获取最后修改时间
     public long getLastModified() {
         return this.mLastModified;
     }
 
+    // 获取删除状态
     public boolean getDeleted() {
         return this.mDeleted;
     }
-
-}
+}
\ No newline at end of file