The best answer, however, to the above objection is afforded by those domestic races which have been modified, chiefly through man's power of selection, for some special purpose.

然而，对上述反对意见最好的回答是由那些主要通过人类的选择能力为了某种特殊目的而发生变异的家养种族提供的。

A structure which has been developed through long-continued selection, when it ceases to be of service to a species, generally becomes variable, as we see with rudimentary organs; for it will no longer be regulated by this same power of selection.

通过长期持续的选择而发展起来的结构， 当它不再为物种服务时， 通常会变得可变， 就像我们在退化器官中看到的那样；因为它将不再受同样的选择能力的支配。