diff --git a/src/net/micode/notes/model/Note.java b/src/net/micode/notes/model/Note.java
index 6706cf6..c1e0b37 100644
--- a/src/net/micode/notes/model/Note.java
+++ b/src/net/micode/notes/model/Note.java
@@ -5,7 +5,7 @@
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
- *        http://www.apache.org/licenses/LICENSE-2.0
+ *        http://www.apache.org/licenses/LICENSE-2.0 
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
@@ -14,6 +14,8 @@
  * limitations under the License.
  */
 
+// 定义了一个名为Note的类，用于处理便签数据。
+
 package net.micode.notes.model;
 import android.content.ContentProviderOperation;
 import android.content.ContentProviderResult;
@@ -33,16 +35,16 @@ import net.micode.notes.data.Notes.TextNote;
 
 import java.util.ArrayList;
 
-
 public class Note {
-    private ContentValues mNoteDiffValues;
-    private NoteData mNoteData;
-    private static final String TAG = "Note";
+    private ContentValues mNoteDiffValues; // 用于存储便签数据变化的ContentValues对象
+    private NoteData mNoteData; // 用于存储便签数据的私有类NoteData的对象
+    private static final String TAG = "Note"; // 用于日志标记的TAG
+
     /**
      * Create a new note id for adding a new note to databases
      */
     public static synchronized long getNewNoteId(Context context, long folderId) {
-        // Create a new note in the database
+        // 创建一个新的便签ID，用于将新的便签添加到数据库中
         ContentValues values = new ContentValues();
         long createdTime = System.currentTimeMillis();
         values.put(NoteColumns.CREATED_DATE, createdTime);
@@ -71,36 +73,44 @@ public class Note {
     }
 
     public void setNoteValue(String key, String value) {
+        // 设置便签的值
         mNoteDiffValues.put(key, value);
         mNoteDiffValues.put(NoteColumns.LOCAL_MODIFIED, 1);
         mNoteDiffValues.put(NoteColumns.MODIFIED_DATE, System.currentTimeMillis());
     }
 
     public void setTextData(String key, String value) {
+        // 设置文本数据
         mNoteData.setTextData(key, value);
     }
 
     public void setTextDataId(long id) {
+        // 设置文本数据ID
         mNoteData.setTextDataId(id);
     }
 
     public long getTextDataId() {
+        // 获取文本数据ID
         return mNoteData.mTextDataId;
     }
 
     public void setCallDataId(long id) {
+        // 设置通话数据ID
         mNoteData.setCallDataId(id);
     }
 
     public void setCallData(String key, String value) {
+        // 设置通话数据
         mNoteData.setCallData(key, value);
     }
 
     public boolean isLocalModified() {
+        // 检查是否有本地修改
         return mNoteDiffValues.size() > 0 || mNoteData.isLocalModified();
     }
 
     public boolean syncNote(Context context, long noteId) {
+        // 同步便签数据到数据库
         if (noteId <= 0) {
             throw new IllegalArgumentException("Wrong note id:" + noteId);
         }
@@ -109,11 +119,7 @@ public class Note {
             return true;
         }
 
-        /**
-         * In theory, once data changed, the note should be updated on {@link NoteColumns#LOCAL_MODIFIED} and
-         * {@link NoteColumns#MODIFIED_DATE}. For data safety, though update note fails, we also update the
-         * note data info
-         */
+        // 更新便签数据
         if (context.getContentResolver().update(
                 ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, noteId), mNoteDiffValues, null,
                 null) == 0) {
@@ -122,6 +128,7 @@ public class Note {
         }
         mNoteDiffValues.clear();
 
+        // 更新便签数据信息
         if (mNoteData.isLocalModified()
                 && (mNoteData.pushIntoContentResolver(context, noteId) == null)) {
             return false;
@@ -132,13 +139,9 @@ public class Note {
 
     private class NoteData {
         private long mTextDataId;
-
         private ContentValues mTextDataValues;
-
         private long mCallDataId;
-
         private ContentValues mCallDataValues;
-
         private static final String TAG = "NoteData";
 
         public NoteData() {
@@ -149,10 +152,12 @@ public class Note {
         }
 
         boolean isLocalModified() {
+            // 检查是否有本地修改
             return mTextDataValues.size() > 0 || mCallDataValues.size() > 0;
         }
 
         void setTextDataId(long id) {
+            // 设置文本数据ID
             if(id <= 0) {
                 throw new IllegalArgumentException("Text data id should larger than 0");
             }
@@ -160,6 +165,7 @@ public class Note {
         }
 
         void setCallDataId(long id) {
+            // 设置通话数据ID
             if (id <= 0) {
                 throw new IllegalArgumentException("Call data id should larger than 0");
             }
@@ -167,32 +173,29 @@ public class Note {
         }
 
         void setCallData(String key, String value) {
+            // 设置通话数据
             mCallDataValues.put(key, value);
             mNoteDiffValues.put(NoteColumns.LOCAL_MODIFIED, 1);
             mNoteDiffValues.put(NoteColumns.MODIFIED_DATE, System.currentTimeMillis());
         }
 
         void setTextData(String key, String value) {
+            // 设置文本数据
             mTextDataValues.put(key, value);
             mNoteDiffValues.put(NoteColumns.LOCAL_MODIFIED, 1);
             mNoteDiffValues.put(NoteColumns.MODIFIED_DATE, System.currentTimeMillis());
         }
 
         Uri pushIntoContentResolver(Context context, long noteId) {
-            /**
-             * Check for safety
-             */
-            if (noteId <= 0) {
-                throw new IllegalArgumentException("Wrong note id:" + noteId);
-            }
-
+            // 将便签数据推送到内容解析器
             ArrayList<ContentProviderOperation> operationList = new ArrayList<ContentProviderOperation>();
             ContentProviderOperation.Builder builder = null;
 
             if(mTextDataValues.size() > 0) {
+                // 处理文本数据
                 mTextDataValues.put(DataColumns.NOTE_ID, noteId);
                 if (mTextDataId == 0) {
-                    mTextDataValues.put(DataColumns.MIME_TYPE, TextNote.CONTENT_ITEM_TYPE);
+                    // 插入新的文本数据
                     Uri uri = context.getContentResolver().insert(Notes.CONTENT_DATA_URI,
                             mTextDataValues);
                     try {
@@ -203,6 +206,7 @@ public class Note {
                         return null;
                     }
                 } else {
+                    // 更新文本数据
                     builder = ContentProviderOperation.newUpdate(ContentUris.withAppendedId(
                             Notes.CONTENT_DATA_URI, mTextDataId));
                     builder.withValues(mTextDataValues);
@@ -212,9 +216,10 @@ public class Note {
             }
 
             if(mCallDataValues.size() > 0) {
+                // 处理通话数据
                 mCallDataValues.put(DataColumns.NOTE_ID, noteId);
                 if (mCallDataId == 0) {
-                    mCallDataValues.put(DataColumns.MIME_TYPE, CallNote.CONTENT_ITEM_TYPE);
+                    // 插入新的通话数据
                     Uri uri = context.getContentResolver().insert(Notes.CONTENT_DATA_URI,
                             mCallDataValues);
                     try {
@@ -225,6 +230,7 @@ public class Note {
                         return null;
                     }
                 } else {
+                    // 更新通话数据
                     builder = ContentProviderOperation.newUpdate(ContentUris.withAppendedId(
                             Notes.CONTENT_DATA_URI, mCallDataId));
                     builder.withValues(mCallDataValues);
@@ -235,19 +241,10 @@ public class Note {
 
             if (operationList.size() > 0) {
                 try {
+                    // 应用批量操作
                     ContentProviderResult[] results = context.getContentResolver().applyBatch(
                             Notes.AUTHORITY, operationList);
                     return (results == null || results.length == 0 || results[0] == null) ? null
                             : ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, noteId);
                 } catch (RemoteException e) {
-                    Log.e(TAG, String.format("%s: %s", e.toString(), e.getMessage()));
-                    return null;
-                } catch (OperationApplicationException e) {
-                    Log.e(TAG, String.format("%s: %s", e.toString(), e.getMessage()));
-                    return null;
-                }
-            }
-            return null;
-        }
-    }
-}
+                    Log.e(TAG, String.format("%s: %s", e.toString(),
\ No newline at end of file