来自《耶鲁大学开放课程：博弈论 第1集 第1集》

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  Raise your hands and keep them up if you chose Alpha now.
  选α的请举手 然后先别放下手
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  How about if you chose Beta now?
  谁选了β呢
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  So one or two Beta's, mostly Alpha's.
  只有一两个β 基本都是选α的
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  Well let's see. Let's reason this through a second.
  我们来分析一下
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  Does my Alpha dominate my Beta?
  我选α优于选β吗
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  No, in fact, alpha doesn't dominate Beta for me.
  没有 对我来说选α并不优于β
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  It doesn't dominate Beta.
  策略α并不优于β
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  If my pair chooses Alpha then Alpha gets me 0; Beta -3.
  如果我对手选α那么我选α得0选β的-3
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  So Alpha does better. But if my pair chooses Beta,
  此时选α较好 但是如果我对手选β
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  then Alpha gets me -1; Beta gets me 1.
  我选α得-1 选β得1
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  In this case Beta is better.
  这回选β更好了
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  As we saw before, Alpha is better against Alpha.
  就像我们看到的 她选α我最好选α