把这一句，留给此刻的你

Darwin based his theory on generalizations that were strictly empirical. You can go out and see that organisms do vary, that variations are inherited, and that every organism is capable of increasing its numbers in sufficiently favorable circumstances.

达尔文的理论是建立在严格经验主义的概括基础上的。你可以走出去，看到生物体确实在变化，变异是遗传的，每一个生物体都有能力在足够有利的环境下增加自己的数量。

— George C. Williams 乔治·威廉斯