And you're doing that through unnatural selection.

你在进行非然选择。

We've created the next chapter in natural selection.

我们创造了然选择新的篇章。

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

然选择也许更偏爱那些乐于带孩子男人的后代。

Natural selection hits on a good design.

然选择的图案都是最好的。

This means that we are the result of natural selection.

这意味着我们是然选择的结果。

Selection for gaudy plumage therefore works in both directions.

因此绚丽羽毛在然选择往两个方向发展。

That's because there are other aspects of evolution besides natural selection.

因为除了然选择，依然有其他进化的因素。

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

这是一种性选择的，然选择的影响。

So that's a lot of variation on which natural selection can act.

因此，然选择可以发挥作用的变异有很多。

Natural selection is the process through which populations of living organisms adapt, reproduce, and change.

然选择是生物种群适应、繁殖和变化的过程。

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

我们要找认为然选择很难证明的观点。

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

回答了这个问题，有助于理解然选择。

But, as is often the case, natural selection knocks humanity's best efforts into a cocked hat.

但通常然选择把人类最大的努力打得一败涂地。

The one we know best is Darwinian natural selection.

其中最广为人知的理论之一就是 达尔文的然选择论。

The fact that farming replaced hunting and gathering more and more created natural-selection pressure.

农业取代狩猎和采集的事实越来越多，产生然选择压力。

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

这样的基因变异通常会在后代的然选择中被淘汰掉。

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

然选择和性选择接二连三地淘汰了弱者和胆小鬼。

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

但第二种力量——然选择——绝对不是随机的。

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

内瑟博士认为焦虑是然选择的结果。

It causes natural selection, which causes the prey species to become faster, stronger, quicker.

这推动了然选择，使猎物物种变得更快、更强、更敏捷。