来自《耶鲁大学开放课程—哲学：死亡 第7集 第7集》

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  just seems false.
  但实际上是错误的
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  Think about some examples.
  想想一些例子吧
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  Well, let's see, a biologist might study,
  比如说 生物学家
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  or a zoologist might study, cats.
  或者动物学家可能会研究猫
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  Takes one to know one
  不过同类互知
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  so the biologist must himself be a cat.
  那么这个生物学家他自己必须是猫
• 
  
  Well, that's clearly false.
  这显然是错的
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  You don't have to be feline to study the feline.
  你不需要变成猫来研究猫科动物
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  Takes one to know one;
  同类才能互知
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  so, you can't be a Canadian and study Mexicans,
  所以加拿大人就不能研究墨西哥人
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  because it takes one to know one.
  因为只有同类才能互知
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  Well, that's just clearly stupid.
  那实在是太愚蠢了