在这个办公室里服务是感受每个美国人之间血族关系的个人感觉。

To have served in this office is to have felt a very personal sense of kinship with each and every American.

youdao

但是，由于古代血族关系的性质，如我们所知，异族结婚不提供适宜的安全反对血缘亲近的人们的结合。

But, owing to the nature of ancient kinship, as we have seen it, exogamy afforded no proper security against the intermixture of persons near of kin.

youdao

换句话说，在血族关系的根源是一个只能通过观察和反思辨别的物理事实——因此必然是一个长期没注意到的事实。

In other words, at the root of kinship is a physical fact, which could be discerned only through observation and reflection - a fact, therefore, which must for a time have been overlooked.

youdao