来自《耶鲁大学开放课程：心理学导论 第4集 第4集》

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  and those are the ones that go extinct.
  不再出现
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  And it might occur to some of you
  也许你们之中会有人觉得
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  that this seems to be an analogy
  这和达尔文的自然选择理论
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  with the Darwinian theory of natural selection
  看上去很相似
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  where there's a random assortment of random mutations.
  自然选择就是随机突变的随机分配
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  And sexual selections give rise to a host of organisms,
  性选择导致了大量有机体的产生
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  some of which survive
  其中的一些有机体生存了下来
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  and are fit
  适应了竞争
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  and others which aren't.
  而其他则遭到淘汰
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  And in fact, Skinner explicitly made the analogy
  实际上 斯金纳也确实明确地
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  from the natural selection of species
  对物种的自然选择
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  to the natural selection of behavior.
  同行为的自然选择进行过类比