来自《耶鲁大学开放课程：博弈论 第2集 第2集》

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  I need to know that other people are rational,
  我也知道对手也是理性的
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  and I need to know that other people know
  我还需要知道对手们明白
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  that other people are rational.
  他们的对手也是理性的
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  So to get this slice, this next slice here, I need rationality;
  要剔除这个范围 需要理性因素
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  as some of you know
  可能有些人知道
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  that's widely criticized in the social sciences these days.
  这一点最近社会科学界广受质疑
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  Are we right to assume that people are rational?
  人是理性的这个假设是否正确
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  To get this slice I need rationality,
  想要剔除这个范围我首先得理性
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  I need knowledge of rationality,
  我需要理性的知识
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  let's call that KR
  我们记理性为KR
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  and I need knowledge of knowledge of rationality.
  并且我们需要知道别人也是理性的
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  As I go down further, I'm going to need rationality,
  进一步推理就是 我是理性的