Exogamy remains much less prevalent among African Americans.

姻在非洲裔美国人中仍然很少见。

For two millennia, exogamy was a major transgression for Jews.

两千年来，直是犹太人的大禁忌。

The chief of these questions respect the origin of exogamy and of endogamy.

这些问题中最首要的同外制和内制的起源有关。