"Public education is our greatest tool - arming people with knowledge about the ways in which common criminal enterprises have tried to take advantage of them."

VOA: special.2011.06.24

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