Private is what you really think but you don't tell people.

私下的刻板印象是你真实的想法,但你不会告诉别人。

耶鲁公开课 - 心理学导论课程节选

That's not really what I think, but that's how disturbing it is when people talk, and very nice students who do not realize this often disrupt my line of thinking.

虽然那不是我的真实想法,但是在课上有人讲话确实很烦人,有些好学生也没有意识到这点,他们经常会打断我的思路

耶鲁公开课 - 基础物理课程节选