上课时你必须保持安静。
We must keep quiet in the library.
我们在图书馆里必须保持安静。
You must keep quiet in the library.
你在图书馆里应该保持安静。
我们必须保持安静。
You must keep quiet at school library.
你在学校图书馆必须保持安静。
We must keep quiet in the reading room.
在阅览室我们必须保持安静。
Every one must keep quiet when dancing.
跳舞时要保持安静。
你必须保持安静。
Those boys in the corner there must keep quiet.
那边角上的几个孩子必须保持安静。
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。
Keep quiet! The baby is sleeping. We must keep our classroom clean.
那婴儿正在睡觉，保持安静！我们必须保持我们的教室干净。
"Quiet down a bit, fellows. Order. We must keep order! " one of the deputies shouted.
同学们，安静点，秩序，我们要保持秩序。
We must not and cannot keep quiet.
我们绝不能，不能保持沉默。
We must not and cannot keep quiet.
我们绝不能，不能保持沉默。
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