But there's also questions of group differences.

但也存在群体差异的问题。

Does that mean that group differences are largely the result of genetic causes?

那是否意味着群体差异主要是由遗传原因造成的呢？

But how do we explain the group difference?

但我们如何解释组间差异？

The group difference, the fact that you will do much worse than you, has to do with the exams I give.

成绩差异是因为我出的考试难度比你们要高。

There are lots of factors that play into these inequalities across groups – differences in education levels, differences in family composition, differences in occupation choice.

造成这些群体间不平等的因素有很多——教育水平的差异、家庭构成的差异、职业选择的差异。

And evolutionary theory can help us say intelligent things about what sort of group differences you should expect because evolutionary theory predicts that some populations should evolve in different ways than others.

进化论可以帮助我们就应该期待什么样的群体差异做出明智的判断，因为进化论预测某些群体应该以与其他群体不同的方式进化。

Again, the textbook has a good discussion of this but I'm going to give two reasons from the textbook that at least group differences are at least to a large extent due to environmental and not genetic causes.

再一次提到， 教科书对此有很好的讨论， 但我将从教科书中给出至少两个原因， 表明至少在很大程度上， 群体差异是由环境而不是基因原因所致。