来自《耶鲁大学开放课程：心理学导论 第11集》

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  and any lionesses undergo spontaneous abortions.
  并且所有怀孕的雌狮自然而然的流产了
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  This all might seem very cruel
  这看起来非常的残忍
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  but from a genetic standpoint it makes sense.
  但是从基因的角度来看是很有道理的
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  The other cubs are genetic competition for him.
  那些小狮子对他来说都是基因上的竞争者
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  They do not have his genes.
  他们没有他的基因
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  Moreover, only once they're out of the way
  更重要的是 只有它们让路了
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  can he reproduce and copulate with the females.
  他才可以和雌狮们交配及繁衍后代
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  The females do their spontaneous abortions
  雌狮们自然的流产
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  because that's a reliable adaptive trick.
  因为这是一个很现实的适应技巧
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  These cubs are not going to survive once they are born
  这些小狮子们生下来也活不成
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  so the female's best strategy
  所以雌性的最佳选择
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  is to get rid of them and start anew.
  就是抛弃它们并重新开始