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1·There's a lurking variable which is just that people are more likely to be born in June.

有一个隐藏变量，那就是大多数人都是在六月出生的。

2·That there's a lurking variable which is just that people are more likely to be born in June.

人们的研究对象之中有一个隐藏变量，那就是大多数人都是在六月出生的。