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

If you're not participating in discussion section, you're not doing what the section is there for.

如果你不参与讨论，那你你就没有做到这个讨论所要求的。

耶鲁公开课 - 死亡课程节选