1. How to deal with the situation that the machine is silent and the screen has no display?
2. How to deal with the situation that the machine is silent but the screen displays?
3. How to deal with the failure of machine keys?
4. How to deal with the distortion of machine sound?
5. How to deal with MP3 playing without sound?
6. How to deal with the machine without transcription function?
7. After the machine is connected to the computer, how to deal with the problem that the file cannot be downloaded normally?
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