单词：natural experiment
natural experiment的用法和样例：
例句
- Wasn't the Montreal strike a pretty good natural experiment to test the hypothesis that belief in God makes us good?蒙特利尔罢工难道不是一个很好的自然实验去测试信仰上帝是否能够让我们行善吗？
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each a.各自的，每 pron.每个，各自 eager a.热切的，渴望的 eagle n.鹰 ear n.耳朵，耳状物；听力，听觉 early ad.早，在初期；最早 a.早期的；早熟的 earn vt.挣得，
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check,examine,experiment,test check 指校对（文章、书信等）或找错、检查。 examine 表示察看或观察以了解情况，仔细检查。 experiment表示为了发现或证明某个事实而进行操作。 test表示以某种手段来试
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