来自《耶鲁大学开放课程：博弈论 第23集 第23集》

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  some of these restaurants are clean and some of them are not so clean.
  有些餐馆很干净而有些却不是很干净
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  Is this true? So it turns out that until the late nineties,
  没错吧 最后在九十年代后期的时候
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  the Los Angeles Municipality rules, local law,
  洛杉矶当局颁布了一条法令
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  said that every restaurant in Los Angeles County,
  要求在洛杉矶辖区内的所有餐馆
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  I think it was, had to get visited by the health inspector.
  都必须接受卫生检查
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  And the health inspector would come around, I think it was annually,
  卫生检查员我记得是每年检查一次
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  and go to these restaurants and they would issue a certificate,
  他们会给该餐馆颁发一个证书
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  and this was a health certificate and written on it large letters,
  卫生证书上面印了一个很大的字母
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  I think they were red letters, was either A, or B, or C.
  我记得是红色的 要么是A或B或C
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  There may even have been A- as well,
  当然也有A-了
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  but for the purpose of the story let's just call it A, B, and C.
  但是方便起见我们就说A或B或C吧
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  Now that was all the law said.
  法律就是这么规定的