She will sell you a cowboy hat made to fit the exact size of your head.

VOA: special.2009.02.16

So it's true that Ale knows that at least one person in the room has a pink hat on their head.

所以艾尔确实知道,至少有一个人戴着粉色的帽子

耶鲁公开课 - 博弈论课程节选

Well I'll reveal the facts now: that in fact Ale knows that Kaj has a pink hat on his head.

我已经告诉你们了,艾尔只知道卡佳戴着粉色帽子

耶鲁公开课 - 博弈论课程节选

Wear a hat or other head covering when in the sun.

VOA: special.2010.07.27

And it's true that Kaj knows that Ale has a pink hat on his head.

而且卡佳也知道艾尔戴着粉色的帽子

耶鲁公开课 - 博弈论课程节选

But notice that Ale doesn't know the color of the hat on his own head.

注意一下,艾尔不知道他头上的帽子是什么颜色

耶鲁公开课 - 博弈论课程节选

Here's a hat on Ale's head, and here's a hat on Kaj's head.

一个给艾尔,一个给卡佳

耶鲁公开课 - 博弈论课程节选

So again, they both know that someone in the room has a pink hat on their head: it is mutual knowledge that there's a pink hat in the room.

但是他们都知道,至少有一个人戴着粉色帽子,至少有一顶粉色帽子是相互知识

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