来自《耶鲁大学开放课程：博弈论 第9集 第9集》

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  One reason it's not immediately obvious
  它之所以是个棘手的问题
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  is not only is no strategy dominated here,
  不光是因为这里找不到劣势策略
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  but there is no pure strategy Nash Equilibrium in this game,
  而且还因为它没有纯策略纳什均衡
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  In this little sub game.
  在这个小小的“博中博”问题里
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  there is no pure strategy Nash Equilibrium,
  不存在纯策略纳什均衡
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  and notice that I added the qualifier now.
  注意下我加入了修饰语
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  Previously I would just have said Nash Equilibrium,
  以前我只说纳什均衡就可以了
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  but now that we have mixed strategies in the picture,
  如今既然我们讲了混合策略
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  I am going to talk about pure strategy Nash Equilibrium,
  那我就得说纯策略纳什均衡
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  it was those that are the only involving pure strategies.
  即只包含纯策略的纳什均衡
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  Okay, so why is there no pure strategy Nash Equilibrium?
  好了 为什么不存在纯策略纳什均衡呢
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  Well let's have a look.
  我们来看一下