Natural selection is the cornerstone principle of evolution.

物竞天说是进化论基础原则。

Natural selection rewarded our ancestors for collaboration, and for forming connections with each other.

在物竞天中，我们祖先互相合作，并且建立彼此关系而存活下来。

We've created the next chapter in natural selection.

我们创造了自然新篇章。

I believe in Darwin's theory of natural selection.

我相信达尔文自然理论。

The one we know best is Darwinian natural selection.

其中最广为人知理论之一就是 达尔文自然论。

To answer this question, it helps to understand natural selection.

回了这个问题，有助于理解自然。

Dr Nesse suggests that anxiety is a result of natural selection.

内瑟博士认为焦虑是自然结果。

If natural selection were to work, some alternative, unconsidered mechanism was required.

如果自然要起作用话，就得需要某种尚未发现替代机制。

But the second force, natural selection, is definitely not random.

但第二种力量——自然——绝对不是随机。

Well, anxiety may be a result of natural selection.

好吧，焦虑可能是自然结果。

This is a form of sexual selection and is subject to natural selection.

这是一种性形式，受自然影响。

Natural selection hits on a good design.

自然图案都是最好。

Think of it as evolution not by natural selection, but evolution by design.

请把这件事情想像成进化， 而非物竞天，只是它是透过设计来进化。

That's natural selection at work, one of the main drivers of evolution.

这就是自然在起作用，是进化主要驱动力之一。

We're looking for the viewpoint that natural selection is difficult to prove.

我们要找认为自然很难证明观点。

In the wild, any individual manifesting them would probably get short shrift from natural selection.

在野外，任何表现出这些特征个体都可能会受到自然冷落。

One by one, natural selection and sexual selection leave the weak and the timid behind.

自然和性接二连三地淘汰了弱者和胆小鬼。

All of his work was designed to test his grand theory of natural selection.

他所有工作都是为了测试他关于自然宏伟理论。

Natural selection might be expected to favour the progeny of men who enjoy bringing them up.

自然也许更偏爱那些乐于带孩子男人后代。

Such a genetic tweak would ordinarily be winnowed out by natural selection over subsequent generations.

这样基因变异通常会在后代自然中被淘汰掉。