为什么表面上的适应可能是选择其他特性的副作用的另一个原因是，在不同发育时期或者身体的不同部位，基因可能有不同的功用。
Another reason why apparent adaptations can be side effects of selection for other traits is that genes can have different roles at different times of development or in different parts of the body.
罗十二4 正如我们一个身体上有好些肢体，但肢体不都有一样的功用；
Rom. 12:4 For just as in one body we have many members, and all the members do not have the same function.
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