若要回答这些问题，我们必须首先知道婚姻和家庭的起源。

To answer these questions, we need to know the origin of marriage and the family.

youdao

若要回答这些问题，我们必须首先知道婚姻和家庭的起源。

To answer these questions, we need to know the origin of marriage and the family.

youdao