How does natural selection work on human beings?
物竞天择对人类又是如何发挥作用的？
The idea in selection work is to choose trees which are genetically superior.
选择的意思是选择遗传上优良的树木。
The result, once natural selection had done its work over the course of millions of years, was the now familiar cast of Allosaurus and Tyrannosaurus rex.
结果，历经数百万年间的自然选择，形成了我们今日熟知的异特龙和雷克斯霸王龙族群。
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