they gradually get better and better.

你会发现它们越做越好
They throw out all of these behaviors randomly.

它们的这些行为都是随机的
Some of them get reinforced and those are the ones that survive

一些行为得到了强化因而保存了下来
and others don't get reinforced

另一些行为则并未得到强化
and those are the ones that go extinct.

不再出现
And it might occur to some of you

也许你们之中会有人觉得
that this seems to be an analogy

这和达尔文的自然选择理论
with the Darwinian theory of natural selection

看上去很相似
where there's a random assortment of random mutations.

自然选择就是随机突变的随机分配
And sexual selections give rise to a host of organisms,

性选择导致了大量有机体的产生
some of which survive

其中的一些有机体生存了下来
and are fit

适应了竞争