巡回参观时要保持安静。

Keep quiet while you're going around.

我提了一个小小的请求：要她保持安静。

I made a small request: that she keep quiet.

孩子们，站好，保持安静，不要交头接耳。

Stand quietly, children, and try not to talk to your neighbour.

要是你没有什么有用的话要说，最好保持安静。

If you don't have anything constructive to say, I'd rather you kept quiet.

警戒期间他们保持安静。

They were quiet during the alert.

不愿意保持安静者将被逐出房间。

Any person who refuses to keep silent will be conducted out of the room.

她认为只要家里有客人，我和弟弟就应该保持安静，不吵闹。

She thought that my brother and I should be seen and not heard whenever our parents had guests.

obedient的意思是“顺从的，规矩的”，句意为：在一些国家，要求学生在教室要保持安静并循规蹈矩。

In some countries, students are expected to be quiet and________ in the classroom.

在上阅读课之前，Barbara老师一遍又一遍地告诉学生要在图书馆内保持安静。

Before the last Library period, Teacher Barbara asked the students, once more, to be quiet in the library.