上课时你必须保持安静。
You must keep quiet in the library.
你在图书馆里应该保持安静。
You must keep quiet at school library.
你在学校图书馆必须保持安静。
你必须保持安静。
You have a cold, so you must keep quiet at home.
你得了感冒，所以必须在家里静养。
We don't allow making noise here, so you must keep quiet.
我们不允许在这儿弄出噪音，请你保持安静。
You must keep them quiet, and see that they behave well and do not waste their food.
你要让他们保持安静，让他们守规矩，不要浪费粮食。
You must keep them quiet, and see that they behave well and do not waste their food.
你要让他们保持安静，让他们守规矩，不要浪费粮食。
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