Mike is the black sheep of the company.

麦克是公司的黑羊。[正译]麦克是公司的害群之马。

He is the black sheep of our class.

他是我们这一班的害群之马。

I am the black sheep of the family.

我是家庭的害群之马。

He is the black sheep of her family.

他是他们家的败家子。

Jim is the black sheep of our class.

吉姆是我们班的一匹黑马。