... must do 必须做 must keep quiet 必须保持安静 must not do sth.= mustn’t do sth. 不准；禁止做 ...
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看书时必须保持安静 Must remain quiet when reading ; When reading must be quiet
你必须保持安静 You Must Keep Quite
必须保持安静
It is necessary to keep quiet
以上为机器翻译结果，长、整句建议使用 人工翻译 。
你在学校图书馆必须保持安静。
You must keep quiet at school library.
youdao
我们必须保持安静。
We must keep quiet.
看电影的时候，你必须保持安静。
You keep quiet while watching the film.
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