1. He is the black sheep of the family.
他是家里的异类。

2. Every family has its black sheep.
每个家庭都有一个害群之马。

A: Why does he never join our family dinners?
A：为什么他不参加我们的家庭聚餐？

B: He is the black sheep of the family.
B：他是家里的那个异类。

1) 家族中的异类

2) 不合群的人

3) 害群之马

1. 异类；害群之马

e.g. He was always the black sheep of the family.
他一直是家里的那个异类。

idiom

1. A member of a group or family who is different from the others in a way that is disapproved of

Synonym: misfit, outcast