And I wanted to show that common knowledge is not such an obvious a concept, as I've made it seem on the board.

我想让大家明白,共同知识并不是像我写在黑板上的,是一个想当然的概念

耶鲁公开课 - 博弈论课程节选

Here is a fact, so is it common knowledge that -- is it common knowledge that at least one of these people has a pink hat on their head?

我这样说这是共同知识吗,至少有一个人戴着粉色的帽子,这是共同知识吗

耶鲁公开课 - 博弈论课程节选