diff --git a/en/application-dev/media/audio-playback.md b/en/application-dev/media/audio-playback.md
index 2b0f260908c9e2986269601e588659ce6ce119fc..d65d0abfc4d4649f7f1847abdbe6fb0a832e194e 100644
--- a/en/application-dev/media/audio-playback.md
+++ b/en/application-dev/media/audio-playback.md
@@ -39,38 +39,38 @@ function printfDescription(obj) {
 
 // Set the player callbacks.
 function setCallBack(audioPlayer) {
-    audioPlayer.on('dataLoad', () => {              // Set the 'dataLoad' event callback, which is triggered when the src attribute is set successfully.
+    audioPlayer.on('dataLoad', () => { // Set the `dataLoad` event callback, which is triggered when the src attribute is set successfully.
         console.info('audio set source success');
-        audioPlayer.play();                         // The play() API can be invoked only after the 'dataLoad' event callback is complete. The 'play' event callback is then triggered.
+        audioPlayer.play(); // The play() API can be invoked only after the 'dataLoad' event callback is complete. The 'play' event callback is then triggered.
     });
-    audioPlayer.on('play', () => {                  // Set the 'play' event callback.
+    audioPlayer.on('play', () => { // Set the `play` event callback.
         console.info('audio play success');
-        audioPlayer.pause();                        // Trigger the 'pause' event callback and pause the playback.
+        audioPlayer.pause(); // Trigger the 'pause' event callback and pause the playback.
     });
-    audioPlayer.on('pause', () => {                 // Set the 'pause' event callback.
+    audioPlayer.on('pause', () => { // Set the `pause` event callback.
         console.info('audio pause success');
-        audioPlayer.seek(5000);                     // Trigger the 'timeUpdate' event callback, and seek to 5000 ms for playback.
+        audioPlayer.seek(5000); // Trigger the 'timeUpdate' event callback, and seek to 5000 ms for playback.
     });
-    audioPlayer.on('stop', () => {                  // Set the 'stop' event callback.
+    audioPlayer.on('stop', () => { // Set the `stop` event callback.
         console.info('audio stop success');
-        audioPlayer.reset();                        // Trigger the 'reset' event callback, and reconfigure the src attribute to switch to the next song.
+        audioPlayer.reset(); // Trigger the 'reset' event callback, and reconfigure the src attribute to switch to the next song.
     });
-    audioPlayer.on('reset', () => {                 // Set the 'reset' event callback.
+    audioPlayer.on('reset', () => { // Set the `reset` event callback.
         console.info('audio reset success');
-        audioPlayer.release();                      // Release the AudioPlayer instance.
+        audioPlayer.release(); // Release the AudioPlayer instance.
         audioPlayer = undefined;
     });
-    audioPlayer.on('timeUpdate', (seekDoneTime) => {// Set the 'timeUpdate' event callback.
+    audioPlayer.on('timeUpdate', (seekDoneTime) => { // Set the `timeUpdate` event callback.
         if (typeof(seekDoneTime) == 'undefined') {
             console.info('audio seek fail');
             return;
         }
         console.info('audio seek success, and seek time is ' + seekDoneTime);
-        audioPlayer.setVolume(0.5);                 // Trigger the 'volumeChange' event callback.
+        audioPlayer.setVolume(0.5); // Trigger the 'volumeChange' event callback.
     });
-    audioPlayer.on('volumeChange', () => {          // Set the 'volumeChange' event callback.
+    audioPlayer.on('volumeChange', () => { // Set the `volumeChange` event callback.
         console.info('audio volumeChange success');
-        audioPlayer.getTrackDescription((error, arrlist) => {  // Obtain the audio track information in callback mode.
+        audioPlayer.getTrackDescription((error, arrlist) => { // Obtain the audio track information in callback mode.
             if (typeof (arrlist) != 'undefined') {
                 for (let i = 0; i < arrlist.length; i++) {
                     printfDescription(arrlist[i]);
@@ -78,13 +78,13 @@ function setCallBack(audioPlayer) {
             } else {
                 console.log(`audio getTrackDescription fail, error:${error.message}`);
             }
-            audioPlayer.stop();                      // Trigger the 'stop' event callback to stop the playback.
+            audioPlayer.stop(); // Trigger the 'stop' event callback to stop the playback.
         });
     });
-    audioPlayer.on('finish', () => {                 // Set the 'finish' event callback, which is triggered when the playback is complete.
+    audioPlayer.on('finish', () => { // Set the 'finish' event callback, which is triggered when the playback is complete.
         console.info('audio play finish');
     });
-    audioPlayer.on('error', (error) => {             // Set the 'error' event callback.
+    audioPlayer.on('error', (error) => { // Set the 'error' event callback.
         console.info(`audio error called, errName is ${error.name}`);
         console.info(`audio error called, errCode is ${error.code}`);
         console.info(`audio error called, errMessage is ${error.message}`);
@@ -94,7 +94,7 @@ function setCallBack(audioPlayer) {
 async function audioPlayerDemo() {
     // 1. Create an AudioPlayer instance.
     let audioPlayer = media.createAudioPlayer();
-    setCallBack(audioPlayer);                          // Set the event callbacks.
+    setCallBack(audioPlayer); // Set the event callbacks.
     // 2. Set the URI of the audio file.
     let fdPath = 'fd://'
     // The stream in the path can be pushed to the device by running the "hdc file send D:\xxx\01.mp3 /data/app/el1/bundle/public/ohos.acts.multimedia.audio.audioplayer/ohos.acts.multimedia.audio.audioplayer/assets/entry/resources/rawfile" command.
@@ -107,7 +107,7 @@ async function audioPlayerDemo() {
     }).catch((err) => {
         console.info('open fd failed err is' + err);
     });
-    audioPlayer.src = fdPath; // Set the src attribute and trigger the 'dataLoad' event callback.
+    audioPlayer.src = fdPath; // Set the src attribute and trigger the `dataLoad` event callback.
 }
 ```
 
@@ -119,23 +119,23 @@ import fileIO from '@ohos.fileio'
 export class AudioDemo {
   // Set the player callbacks.
   setCallBack(audioPlayer) {
-    audioPlayer.on('dataLoad', () => {              // Set the 'dataLoad' event callback, which is triggered when the src attribute is set successfully.
+    audioPlayer.on('dataLoad', () => { // Set the `dataLoad` event callback, which is triggered when the src attribute is set successfully.
       console.info('audio set source success');
-      audioPlayer.play();                           // Call the play() API to start the playback and trigger the 'play' event callback.
+      audioPlayer.play(); // Call the play() API to start the playback and trigger the 'play' event callback.
     });
-    audioPlayer.on('play', () => {                  // Set the 'play' event callback.
+    audioPlayer.on('play', () => { // Set the `play` event callback.
       console.info('audio play success');
     });
-    audioPlayer.on('finish', () => {                // Set the 'finish' event callback, which is triggered when the playback is complete.
+    audioPlayer.on('finish', () => { // Set the 'finish' event callback, which is triggered when the playback is complete.
       console.info('audio play finish');
-      audioPlayer.release();                        // Release the AudioPlayer instance.
+      audioPlayer.release(); // Release the AudioPlayer instance.
       audioPlayer = undefined;
     });
   }
 
   async audioPlayerDemo() {
-    let audioPlayer = media.createAudioPlayer();     // Create an AudioPlayer instance.
-    this.setCallBack(audioPlayer);                   // Set the event callbacks.
+    let audioPlayer = media.createAudioPlayer(); // Create an AudioPlayer instance.
+    this.setCallBack(audioPlayer); // Set the event callbacks.
     let fdPath = 'fd://'
     // The stream in the path can be pushed to the device by running the "hdc file send D:\xxx\01.mp3 /data/app/el1/bundle/public/ohos.acts.multimedia.audio.audioplayer/ohos.acts.multimedia.audio.audioplayer/assets/entry/resources/rawfile" command.
     let path = '/data/app/el1/bundle/public/ohos.acts.multimedia.audio.audioplayer/ohos.acts.multimedia.audio.audioplayer/assets/entry/resources/rawfile/01.mp3';
@@ -147,7 +147,7 @@ export class AudioDemo {
     }).catch((err) => {
       console.info('open fd failed err is' + err);
     });
-    audioPlayer.src = fdPath; // Set the src attribute and trigger the 'dataLoad' event callback.
+    audioPlayer.src = fdPath; // Set the src attribute and trigger the `dataLoad` event callback.
   }
 }
 ```
@@ -161,20 +161,20 @@ export class AudioDemo {
 // Set the player callbacks.
   private isNextMusic = false;
   setCallBack(audioPlayer) {
-    audioPlayer.on('dataLoad', () => {              // Set the 'dataLoad' event callback, which is triggered when the src attribute is set successfully.
+    audioPlayer.on('dataLoad', () => { // Set the `dataLoad` event callback, which is triggered when the src attribute is set successfully.
       console.info('audio set source success');
-      audioPlayer.play();                           // Call the play() API to start the playback and trigger the 'play' event callback.
+      audioPlayer.play(); // Call the play() API to start the playback and trigger the 'play' event callback.
     });
-    audioPlayer.on('play', () => {                  // Set the 'play' event callback.
+    audioPlayer.on('play', () => { // Set the `play` event callback.
       console.info('audio play success');
-      audioPlayer.reset();                          // Call the reset() API and trigger the 'reset' event callback.
+      audioPlayer.reset(); // Call the reset() API and trigger the 'reset' event callback.
     });
-    audioPlayer.on('reset', () => {                 // Set the 'reset' event callback.
+    audioPlayer.on('reset', () => { // Set the `reset` event callback.
       console.info('audio play success');
-      if (!this.isNextMusic) {                      // When isNextMusic is false, changing songs is implemented.
-        this.nextMusic(audioPlayer);                // Changing songs is implemented.
+      if (!this.isNextMusic) { // When isNextMusic is false, changing songs is implemented.
+        this.nextMusic(audioPlayer); // Changing songs is implemented.
       } else {
-        audioPlayer.release();                      // Release the AudioPlayer instance.
+        audioPlayer.release(); // Release the AudioPlayer instance.
         audioPlayer = undefined;
       }
     });
@@ -197,8 +197,8 @@ export class AudioDemo {
   }
 
   async audioPlayerDemo() {
-    let audioPlayer = media.createAudioPlayer();       // Create an AudioPlayer instance.
-    this.setCallBack(audioPlayer);                     // Set the event callbacks.
+    let audioPlayer = media.createAudioPlayer(); // Create an AudioPlayer instance.
+    this.setCallBack(audioPlayer); // Set the event callbacks.
     let fdPath = 'fd://'
     // The stream in the path can be pushed to the device by running the "hdc file send D:\xxx\01.mp3 /data/app/el1/bundle/public/ohos.acts.multimedia.audio.audioplayer/ohos.acts.multimedia.audio.audioplayer/assets/entry/resources/rawfile" command.
     let path = '/data/app/el1/bundle/public/ohos.acts.multimedia.audio.audioplayer/ohos.acts.multimedia.audio.audioplayer/assets/entry/resources/rawfile/01.mp3';
@@ -223,19 +223,19 @@ import fileIO from '@ohos.fileio'
 export class AudioDemo {
   // Set the player callbacks.
   setCallBack(audioPlayer) {
-    audioPlayer.on('dataLoad', () => {              // Set the 'dataLoad' event callback, which is triggered when the src attribute is set successfully.
+    audioPlayer.on('dataLoad', () => { // Set the `dataLoad` event callback, which is triggered when the src attribute is set successfully.
       console.info('audio set source success');
-      audioPlayer.loop = true;                      // Set the loop playback attribute.
-      audioPlayer.play();                           // Call the play() API to start the playback and trigger the 'play' event callback.
+      audioPlayer.loop = true; // Set the loop playback attribute.
+      audioPlayer.play(); // Call the play() API to start the playback and trigger the 'play' event callback.
     });
-    audioPlayer.on('play', () => {                  // Set the 'play' event callback to start loop playback.
+    audioPlayer.on('play', () => { // Set the 'play' event callback to start loop playback.
       console.info('audio play success');
     });
   }
 
   async audioPlayerDemo() {
-    let audioPlayer = media.createAudioPlayer();      // Create an AudioPlayer instance.
-    this.setCallBack(audioPlayer);                    // Set the event callbacks.
+    let audioPlayer = media.createAudioPlayer(); // Create an AudioPlayer instance.
+    this.setCallBack(audioPlayer); // Set the event callbacks.
     let fdPath = 'fd://'
     // The stream in the path can be pushed to the device by running the "hdc file send D:\xxx\01.mp3 /data/app/el1/bundle/public/ohos.acts.multimedia.audio.audioplayer/ohos.acts.multimedia.audio.audioplayer/assets/entry/resources/rawfile" command.
     let path = '/data/app/el1/bundle/public/ohos.acts.multimedia.audio.audioplayer/ohos.acts.multimedia.audio.audioplayer/assets/entry/resources/rawfile/01.mp3';
@@ -247,7 +247,7 @@ export class AudioDemo {
     }).catch((err) => {
       console.info('open fd failed err is' + err);
     });
-    audioPlayer.src = fdPath; // Set the src attribute and trigger the 'dataLoad' event callback.
+    audioPlayer.src = fdPath; // Set the src attribute and trigger the `dataLoad` event callback.
   }
 }
 ```