In this way, a species can go from having one gene with two functions to two genes that each carry out one function. This increase in complexity occurs not because of selection but despite it.
这样，一个物种可以从拥有一个基因带有两种功能演变到拥有两个基因各自表达其中一种功能。这种复杂性增加的发生不是因为自然选择。
When it comes to the admiration of spring, it could be put this way: a door makes it possible for one to go out, whereas a window makes it possible for one not to have to.
若据赏春一事来看，我们不妨这样说：有了门，我们可以出去；有了窗，我们可以不必出去。
When it comes to the admiration of spring, it could be put this way: a door makes it possible for one to go out, whereas a window makes it possible for one not to have to.
若据赏春一事来看，我们不妨这样说：有了门，我们可以出去；有了窗，我们可以不必出去。
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