詞匯

1.?????lack?缺乏，不足

2.?????worsen?（使）惡化

3.?????youngster?青少年

4.?????average?平均

5.?????advise?建議

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Youngsters lack of sleep

Lack of sleep among children and teenagers in China has worsened in the past 10 years. About 80% of children don’t have enough sleep on school days. Chinese youngsters sleep for 7.8 hours a day on average in 2020.?

But experts advise primary school students to sleep for at least 10 hours at night. 9 hours is suggested for junior high school students and 8 hours for senior high school students. If youngsters don’t have enough sleeping time, it will do harm to their health.