来自《耶鲁大学开放课程：博弈论 第20集 第20集》

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  So in the second stage, if they both quit in the second stage
  在第二轮中 双方如果都放弃
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  then their payoffs are going to be, for A, -C,
  他们的收益便是A得到-C
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  the costs they accumulated in the first stage,
  这个是第一轮的收益的
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  plus 0.
  累计加上零
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  And, for B, -C + 0.
  对于B是-C+0
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  If A quits and B fights in the second stage
  若第二轮是A放弃B攻击
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  then the payoffs are -C + 0 and -C + V.
  那么收益便是-C+0和-C+V
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  If A fights and B quits
  若A攻击B放弃
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  then the payoffs are -C + V and -C + 0.
  那么收益便是-C+V和-C+0
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  And if they both fight for two periods,
  若都选择攻击
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  we have a decision to make
  接下来我们得先决定如何
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  about how we're going to end the game in this two period game,
  结束这个两阶段博弈