来自《耶鲁大学开放课程：博弈论 第9集 第9集》

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  I'm going to push that up a little high, sorry.
  我把这块黑板推到上面去吧
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  So now I want to think about
  接下来我们思考一下
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  what are the payoffs that I get from mixed strategies,
  如何计算混合策略的收益呢
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  and again, I'm going to go a little slowly
  这一回我稍微慢点讲
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  because it's a little tricky at first
  因为刚开始可能会有点难
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  and we'll get used to this, don't panic,
  各位不必慌张 熟悉了就好了
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  we'll get used to this as we go on and
  随着课程的深入和不断地练习
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  as you see them in homework assignments and in class.
  大家都能很好地掌握混合策略的
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  So let's talk about the payoffs from a mixed strategy.
  下面我们来学习混合策略的收益
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  Payoffs from a mixed strategy.
  混合策略的收益
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  In particular, what we're going to worry about are expected payoffs.
  其实我们要研究的是预期收益
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  So the expected payoff of the mixed strategy P,
  混合策略P的预期收益是