We are talking about a society,therefore, the anthropologists have come up with, which I think is a useful distinction.

因此,我们所说的这个社会是一个...,人类学家已经提出了一种区分的方法,我认为很有用

耶鲁公开课 - 古希腊历史简介课程节选

I think it's important for the children to really become involved in things that maybe important to them.

我认为孩子们,积极参与,对自己有用的事情很重要。

麻省理工公开课 - 媒体、教育、市场课程节选