来自《耶鲁大学开放课程：博弈论 第2集 第2集》

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  And the catch is, you can only defend one of these two routes.
  问题是你只能防守二者之一
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  If you want a real world example of this,
  现实世界也有这样的例子
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  think about the third Century B.C.,
  大概在公元前三世纪
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  someone can correct me afterwards.
  如果我说错了请大家来纠正
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  I think it's the third Century B.C.
  我记得是公元前三世纪
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  when Hannibal is thinking of crossing the Alps.
  当时汉尼拔的想翻越阿尔卑斯山
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  Not Hannibal Lecter
  我说的不是汉尼拔·莱格
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  Hannibal the general in the third Century B.C..
  而是公元前三世纪的汉尼拔将军
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  The one with the elephants.
  那个骑大象的汉尼拔将军
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  Okay, so the key here is going to be that there are two passes.
  好了 这里的关键问题是有两条路
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  One of these passes is a hard pass. It goes over the Alps.
  一条路崎岖 需要翻越阿尔卑斯山
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  And the other one is an easy pass. It goes along the coast.
  另一条路平坦 只需沿着海岸线走