来自《耶鲁大学开放课程：博弈论 第9集 第9集》

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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
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  let's be consistent and call it Pi,
  我们保持一致 还是称之为Pi吧
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  the mixed strategy Pi is what?
  混合策略Pi的预期收益是什么呢
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  It's the weighted average.
  其实是个加权平均数
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  it's a weighted average or a weighted mixture if you like,
  是该混合策略中
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  of the expected payoffs of each of the pure strategies in the mix.
  每个纯策略预期收益的加权平均数
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  So this is a long way of saying something again
  我们费了很多工夫来解释混合策略