来自《耶鲁大学开放课程：博弈论 第19集 第19集》

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  Each strategy tells the player
  每个策略都告诉参与人
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  how they should move at every information set of that player.
  在不同信息集下应该如何行动
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  So even if the strategy is such that information set won't be reached,
  因此即使有些博弈中信息集无法获得
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  the strategy still has to tell you what you would do when you got there.
  策略仍然为参与人在当前状况下提供指示
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  And now for the first time perhaps
  这可能是我们第一次认识到
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  we're going to see why that redundancy helps us.
  这些赘述是怎么帮助我们解决问题的
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  So let's look at the instructions.
  我们来看看这些指示
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  Each of them gives an instruction.
  它们每个都给出了一个指示
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  The first one tells us to play up in this sub-game.
  第一个告诉我们在子博弈中选上
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  The second one says up again,
  第二个也告诉我们选上
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  and notice this was redundant.
  请注意这个就是多余的
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  Once you've chosen Down
  因为一旦你选了下