They controlled for changes due to social and cultural factors to calculate how strongly natural selection is shaping these traits.
研究小组严格控制了社会及文化因素引起的差异，以便单纯研究自然选择对这些特征的选择性到底有多强。
This nature is determined by the interaction of such three factors as individual's natural qualities, social circumstances and personal consciousness.
这种本质是由个人所独具的自然素质，社会遇境和个人意识三个方面的因素交互作用，共同决定的。
It is a land of natural ecosystems into artificial ecosystem process, is also a natural, economic, and social factors at the complex process.
它既是一个把土地的自然生态系统变为人工生态系统的过程，也是一个自然、经济、社会诸因素综合作用的复杂过程。
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