Some people say that in every family there will be at least one bad person
有人说每个家庭中都会有一个坏蛋。
That person is often said to be the black sheep of the family.
那个人常被称为家中的害群之马，
Moreover, black is commonly associated with evil.
且黑色通常与邪恶有关。
From that comes the saying,
从那儿引申出这句谚语：
"There's a black sheep in every flock. "
“每一个团体中都难免有害群之马。”