Only the individuals of a species are subject to the pressures of natural selection.
只有一个物种的个体感受到自然选择的压力。
If not natural selection, then what?
如果不是自然选择，那么又是什么呢？
That is how natural selection works.
这就是自然选择工作的方式。
The process is natural selection.
这个过程是自然选择。
这是自然选择。
Natural selection, this is not to be.
天生没有选择，这是注定的。
That's what natural selection is all about.
这个就是自然选择。
Natural selection hits on a good design.
自然选择的图案都是最好的。
Natural selection hits on a good design.
当自然选择挑中了一个理想的设计后。
Here's how natural selection is supposed to work.
先来看看自然选择是如何运作的。
Is it part of the natural selection process?
适者生存是物竞天择过程中的一部分吗？
Adaptation is the result of natural selection.
适应是自然选择的结果。
Genetic drift can even counteract natural selection.
基因漂变甚至可以抵消自然选择。
Can natural selection explain human personality?
物竞天择是否能解释人的性格？
Natural selection has done a pretty tasty job already.
自然选择早已做好了品尝味道的工作。
So it really does matter whether natural selection is true.
因此自然选择究竟是否正确，真的非常重要。
It's Darwin's principle of natural selection in action.
这是达尔文的自然选择原则的行动。
Has there been natural selection for a 'language gene'?
有没有“语言基因”的自然天择？
Might evolution by natural selection explain complex thought?
通过自然选择的进化可以解释复杂的思维吗？
Markets and natural selection could help ease the problem, too.
市场及自然选择也可以帮助缓解这个问题。
The idea of evolution by natural selection is not hard to grasp.
自然选择导致进化的观点并不难理解，只需要把几个得到普遍认同的观点联系起来就能够得到。
And the challenge was the theory of evolution by natural selection.
其中极富挑战性的观点则是生物进化是通过自然选择实现的。
Natural selection is what we normally think of as Darwin’s big idea.
我们通常认为自然选择（理论）是达尔文的伟大思想发现。
Natural selection can also, sometimes, be an agent of genetic uniformity.
有时，自然选择也是物种特性统一的推动者。
Darwin's theory of natural selection is intended to answer this question.
达尔文的自然选择理论正是为了回答这个问题。
That they developed naked necks is surely the result of natural selection.
即光脖子物种的出现必然是自然选择的结果。
More important, another chance for natural selection has been removed.
更重要的是，又一次自然选择的机会消失了。
More important, another chance for natural selection has been removed.
更重要的是，又一次自然选择的机会消失了。
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