对人类种群起源和分布的研究曾是基于考古和化石证据。

Study of the origins and distribution of human populations used to be based on archaeological and fossil evidence.

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这项新发现是基于对4.4万名女性的研究得出的。

The new finding is based on a study of 44,000 women.

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我的结论不是基于任何个体研究，而是基于对每个主要英语国家进行的数千项研究的大规模系统回顾。

I base this conclusion not on any individual study, but on large-scale and systematic reviews of thousands of studies conducted in every major English-speaking country.

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