来自《耶鲁大学开放课程：心理学导论 第13集》

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  tend to have statistically more violent kids.
  其孩子有可能更具暴力倾向
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  But maybe the causality goes the other way around.
  但有可能这一因果关系反了
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  Maybe if you have a kid who is a troublemaker
  或许是因为你的孩子爱闹事
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  you're more likely to smack him.
  你才更常揍他
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  Maybe, which seems to be entirely likely,
  更有可能的是 又或许
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  the propensity for violence is to some extent heritable.
  暴力倾向在某种程度上具有遗传性
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  And so, even if the kid
  那么 即使这孩子
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  was not raised by the smacking parent,
  不是被他爱揍人的亲生父母所抚养
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  whatever properties of that parent caused him--
  其父母的特性仍塑造了他...
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  led to that violence got inherited by the kid.
  导致他也遗传到了父母的暴力特征
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  Now, again, this isn't going to sit right for you
  那么 你们可能不大接受这一观点
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  and I've had-- i put this down because last year
  但我...我要讲它 是因为去年