On the other hand, you don't have to withhold information that may be useful to the class.

另一方面,你又不能刻意保留对这门课有用的信息

耶鲁公开课 - 基础物理课程节选

You're not going to need to know a lot about this for this course, but this is--I wanted to get the basic ideas down.

对于本门课程来说,你不必,对刚才讲的概率的知识有很深入的了解,我只想介绍一些概率论的基本概念

耶鲁公开课 - 金融市场课程节选

And he says to me, " "Tal, I hear you teaching a class on happiness."

他对我说，“Tal，我听说你教一门有关快乐的课程“

哈佛公开课 - 幸福课课程节选

If someone comes to your home and says, I would like to sell you life insurance.

如果有个人敲开你家的门并对你说,我是来向您出售人寿保险的

耶鲁公开课 - 金融市场课程节选