Have you heard （听说） of the video sharing app Douyin? It's quite popular these days. There are some interesting and useful （有用的） videos on it. They are very short-from 15 to 30 seconds. I enjoy watching them. But there are some bad things about the app, too. First, it can take up too much of our time. You can easily become addicted （上瘾的） to it. Once, I watch videos for nearly a whole afternoon. I forgot to do my homework. It was a waste （浪费） of time.
Secondly, there are a lot of meaningless （无意义的） videos. For example, some students do some boring things and then post their videos on the app. You can't really learn anything useful by watch these boring videos. I guess just want to tell people that we can learn meaningful things from the Internet. Maybe we shouldn't spend so much time on Douyin.
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