来自《耶鲁大学开放课程：博弈论 第9集 第9集》

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  That will be our first question
  这是我们要首先考虑的问题
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  and we'll come back and construct the payoff for P.
  然后我们再来计算P的收益
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  So these are things we can do I think.
  我觉得这些我们都会算吧
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  So the expected payoff of A against Q is what?
  A对Q的预期收益是多少呢
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  Well, half the time if you play A
  如果你选择策略A
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  you're going to find your opponent is playing a,
  有?的概率面对对手的策略a
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  in which case you'll get 2,
  这时你的收益是2
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  and half the time when you play A you'll find your opponent
  还有?的概率面对对手的策略b
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  is playing b in which case you'll get 0.
  这时你的收益是0
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  So let's just write that up.
  我得把它写到板书上
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  So I'm going to get 2 with probability ? plus 0 with probability ?.
  即我的预期收益是2×?+0×?
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  Everyone happy with that?
  大家都看懂了吗