来自《耶鲁大学开放课程：博弈论 第3集 第3集》

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  against a (?, ?) is 2.5.
  预期收益是2.5
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  So here's a third point we can use.
  这样图上就有三个点了
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  What is this graph going to look like other than these three points?
  除了这三点 剩下的图像是什么样的
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  What's it going to look like other than these three points?
  这三点以外的图像是什么样的呢
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  It's going to be a straight line.
  是一条直线
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  So, you can confirm that for yourself at home,
  你要是不信回去自己验证一下
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  but in fact, if I draw a straight line,
  事实上我画成直线
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  this will actually be correct.
  是绝对正确的
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  So what is this?
  这条线表示什么呢
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  This is my expected payoff from choosing Up
  它表示在对手选择右的不同概率下
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  against the probability of the other person choosing Right,
  我选择上的预期收益
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  and what is it actually equal to,
  并且这也实际上等于