Mister Germont, the head of the Paris police force, came into the room.

VOA: special.2009.12.26

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

After a while, you won't have room in your head for anything.

过段时间你就会发现脑袋不够用了

耶鲁公开课 - 基础物理课程节选

And then,when my head was well in the room, I undid the lantern just so much that a single thin ray of light fell upon the vulture eye.

VOA: special.2009.05.16

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

Now, I look around this room, I don't see anybody whose head is three times bigger than mine, so I know that you cannot digest everything the books have.

我在教室里扫了一遍,没看见谁的脑袋比我大三倍,我知道你们是不可能看完这本书的

耶鲁公开课 - 基础物理课程节选