这种类型的研究被称为病例对照研究，它不能够证明两者之间的因果关系。

This type of study design, known as "case-control," cannot prove cause-and-effect.

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但是他们认为需要进行更多的研究来验证两者之间的因果关系。

But they say more study is needed to confirm this as a cause-and-effect relationship.

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哈佛的一个研究小组进一步研究了两者之间的关系。

A team from Harvard set out to examine this relationship further.

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哈佛的一个研究小组进一步研究了两者之间的关系。

A team from Harvard set out to examine this relationship further.

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