想要证明因果关系，科学家们必须尽量解释这种联系可能出现的原因和方式。

To argue for a cause-and-effect relationship, scientists must attempt to explain why and how a connection could occur.

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当然联系不是因果关系。

Of course correlation is not causation.

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在人类身上做的研究都是观测性的。结果表明，使用手机与癌症有一定联系，但不是因果关系。

The human studies all are observational, showing only an association between cellphone use and cancer, not a causal relationship.

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