1. Because the soundtrack of some computers is Cantonese or English, there are two choices: Mandarin and Cantonese, or Mandarin and English. To switch, you must first open the Youku client on your mobile phone.

2. After logging in, select the video to play and open it.

3. After playing, click the switch button in the lower right corner to switch to full-screen playing.

4. Then click the "..." button at the bottom of the interface.

5. In the two languages that pop up, just choose to switch between them.