来自《耶鲁大学开放课程：现代社会理论基础 第25集 第25集》

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  which are statistically correlated to each other.
  联系在一起的
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  Statistical correlation does not necessarily show
  统计相关性不一定表明
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  that they are--one is causing the other one. Right?
  它们中的一个现象会引起另一个现象
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  You have a theory that the stork brings the baby,
  你的理论是想说 鹳鸟能带来婴儿
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  and then you test this,
  然后你测试这个理论
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  and you show that fertility in Scandinavia is low,
  你说在斯堪的纳维亚半岛的生育率低
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  and there are not many storks.
  而且那里鹳鸟稀少
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  So you have a very strong correlation
  你发现鹳鸟数量和出生的婴儿数量
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  between number of storks and number of babies being born.
  有非常强的相关性
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  This still does not show that,
  但是这无法证明
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  the storks bring the babies. Right?
  鹳鸟会带来婴儿
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  Therefore you have to look at the causal mechanism,
  因此 你必须考虑因果机制