"No, but I would gladly give my life for three brothers

不不过我会很高兴的为三个兄弟
or five nephews or nine first cousins."

或五个外甥或九个一代表亲放弃生命
Now, he's joking.

这里他当然在开玩笑
You don't actually do the math if you're normal.

如果你是正常人的话你不会做这种算术的
But what he's capturing is the logic,

但是他抓住了这其中的逻辑关系
the ultimate causation of our feelings towards our kin.

就是我们对亲属的这种感觉的终极原因
Our genes have wired us up--

我们的基因
our brains up to love our children and love our kin

将我们的大脑设计为爱我们的孩子和亲属
because, in this way, our genes manage to replicate themselves.

这样我们的基因就可以自我复制了
And in fact,

并且事实上
you get his calculations by looking at genetic relatedness.

通过计算基因相关性你能得出相同的结果
The genetic relatedness,

基因相关性