Exogamy remains much less prevalent among African Americans.

异族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，异族一直是犹太人一大禁忌。

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

这些问题中最同外制和内制起源有关。