One thing I do ask you: If you are not doing it, if you don't participate, simply just keep quiet.

我对你们的一个要求是：,如果你不做，不参与的同学，请保持安静。

哈佛公开课 - 幸福课课程节选

I think it's actually owned by McDonald's. But I think they keep that on the quiet

我想它实际上是麦当劳旗下的。但是我想他们不想宣传这个，

知道普雷特公司吗？ - SpeakingMax英语口语达人

For if I say that this is to disobey the god and because of this it is impossible to keep quiet, you will not be persuaded by me on the grounds that I am being ironic.

因为假设我说那是违悖神意,所以我无法保静默，你们不会被我说服,反而会以为我语带讽刺；

耶鲁公开课 - 政治哲学导论课程节选

Secondly, as we go to the more advanced part of the course, we'll take a result from this part of the blackboard, stick it into the second part and keep manipulating, so if I screwed up in the beginning and you guys keep quiet, we'll have to do the whole thing again.

其次,随着我们课程的深入,我们需要把黑板这边的计算结果,抄到黑板的那边,不停地这么做,如果我一开始就写错了,而你们又不出声,我们就得全部重新来过

耶鲁公开课 - 基础物理课程节选