来自《耶鲁大学开放课程：心理学导论 第12集》

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  We like people who cooperate with us.
  我们会与合作伙伴建立感情
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  This motivates us to be nice to them in the future
  促使我们将来能与合作对象和睦相处
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  much as the Tit-for-Tat algorithm says,
  正像投桃报李法则所示
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  "If you are nice to me now, I'll be nice to you back."
  今日投我以桃 他日报之以李
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  We don't like being screwed with.
  我们都憎恨遭人黑手
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  We feel anger and distrust towards those who betray us.
  对于背叛我们的人会心升愤恨和猜疑
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  That motivates us to betray or avoid them in the future.
  因而日后我们就会出卖或避免接触这类人
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  And we feel bad when we betray somebody
  倘若出卖与自己合作的人
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  who cooperates with us.
  心里也会痛苦
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  This motivates us to behave better in the future.
  这将让我们日后更加严格要求自己
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  You can break down the cells of The Prisoner's Dilemma
  你可以从他们给出的情感角度
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  in terms of emotions that they give rise to.
  分解囚徒困境的因素