来自《耶鲁大学开放课程：博弈论 第22集 第22集》

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  and in the third period and thereafter,
  在第三回合和以后的回合
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  we'll just play D, D, D, D, D, D.
  我们都会一直选策略D了
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  So these are just some other deviation other than the one we looked at.
  这是我们讨论的其他方案之一
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  So what payoff do I get from this?
  那这个方案收益如何呢
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  Okay, I get three in the first period,
  我第一回合收益是3
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  just as I did for my original defection,
  这是我头一次选择欺骗
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  that's good news.
  这回合收益还算不错
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  But now in the second period discounted, i actually get -1,
  但是很不幸的是第二回合我的收益是-1
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  I'm actually doing even worse in the second period
  实际上因为杰克在第二回合选择欺骗
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  because I'm cooperating while Jake's defecting,
  我的收益变得更糟糕了
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  and then in the third period I get 0
  接着第三回合收益是0
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  and in the fourth period I get 0 and so on.
  第四回合即以后收益都是0 以此类推