Chinese are famous for being shy，but it's different when we use an app for people to produce and share videos with background audio and special effects（效果）.Everybody turns into a great performer with a good sense of humour.
    The short-form video app（應(yīng)用軟件） Douyin，named TikTok outside China，has become more popular at home and abroad. （1）甚至老年人都能很容易地使用這個軟件。Many people make and share short videos on it.The videos are usually 15 seconds to a few minutes long. （2）They show people some activities like cooking，exercising and singing.
    （3）青少年非常喜歡觀看這些短視頻。 More than 50 percent of first-year and second-year junior high school students say they enjoy watching these short videos.About 47 percent of the high school students have posted their own videos，according to a recent report.The videos let teenagers see funny and exciting things they wouldn't usually see.Many teens like to share the fun things they do with others as well.However，the videos can also cause trouble. （4）Some students spend too much time watching them but a little time studying. Some videos have vulgar（低俗的） information that isn't suitable for teenagers.
    To deal with this problem，Douyin has added a new function.If someone uses the app for 90 minutes nonstop，a reminder will pop up（突然出現(xiàn)）. （5）If teenagers use it for two hours in the same day，the app will be locked.

（1）

Even old people can easily use this app.

Even old people can easily use this app.

（2）

他們向人們展示一些活動，如烹飪、鍛煉和唱歌。

他們向人們展示一些活動，如烹飪、鍛煉和唱歌。

（3）

Teenagers enjoy watching these short videos very much.

Teenagers enjoy watching these short videos very much.

（4）

一些學(xué)生花太多時間看它們，卻花很少的時間學(xué)習(xí)。

一些學(xué)生花太多時間看它們，卻花很少的時間學(xué)習(xí)。

（5）

如果青少年在同一天使用它長達兩個小時，該應(yīng)用軟件將被鎖定。

如果青少年在同一天使用它長達兩個小時，該應(yīng)用軟件將被鎖定。