来自《耶鲁大学开放课程：博弈论 第2集 第2集》

• 
  
  They both look absurd, but never mind.
  他们看起来有点傻 不过没关系
• 
  
  But notice that
  注意一下
• 
  
  Ale doesn't know the color of the hat on his own head.
  艾尔不知道他头上的帽子是什么颜色
• 
  
  So even though both people know,
  所以尽管他们都知道
• 
  
  even though it is mutual knowledge that
  尽管至少有一人戴粉色帽子
• 
  
  there's at least one pink hat in the room,
  是相互知识
• 
  
  Ale doesn't know what Kaj is seeing.
  艾尔不知道自卡佳看到的是颜色的帽子
• 
  
  So Ale does not know that Kaj knows that
  所以艾尔不知道卡佳知道
• 
  
  there's a pink hat in the room.
  这里有一定粉色的帽子
• 
  
  In fact, from Ale's point of view,
  事实上 从艾尔的角度看
• 
  
  this could be a blue hat.
  这很有可能是顶蓝色的帽子
• 
  
  So again, they both know that
  但是他们都知道