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Why is there no sound in the fitness video recorded on Tik Tok last year?
The answer is as follows

Because of this Tik Tok, every video was sent by this author. When the author sends a video, he always configures the video as a work with or without sound, so when you brush the video, there will be such a situation, some works have sound and some works have no sound, so it is normal to brush Tik Tok sometimes without sound and sometimes with sound.