Kent is the black sheep of the family. 肯特是我们家的害群之马. The rotten apple spoils the barrel. 一粒老鼠屎, 坏了一锅粥. Boy, your friends are a colorful bunch. 乖乖, 你交的朋友, 三教交流无所不有. He's bad company. 他是坏胚子. 他不值得你交往. He is poison. 他像毒药.
Don't hang around with scum bags. 避免和素行不良的人打交道.
