but there's no adaptive reason

但没有合理的理由说明
why humans who have evolved in different parts of the world

为什么世界上不同地区的人在进化中
should have profound differences in their mental capacities.

产生心理能力上的巨大差异
What does evolutionary theory say about sex differences?

那进化论又是怎样解释性别差异的呢
Well, it says some interesting things,

它说的很有意思
and we're going to devote a class to discussing them,

并且我们会用一节课专门来讲这个话题
but what I think is going to be true--

但是我认为正确的是
proved to be important is that

真正重要的是
we'll be able to use evolutionary biology to talk sensibly about

我们能够用进化生物学知识来合理解释
what sort of distinctions between the sexes,

性别差异
between males and females,

男性和女性的差异
one would expect to find and what sort one wouldn't expect to find.

我们期待发现什么和不发现什么