1. Bite the hand who feeds you 恩将仇报，忘恩负义
You are biting the hand who feeds you by saying this - anyway,I'm your boss.
你这样说是恩将仇报——不管怎么说我也是你老板。
释义：
bite: 咬；feed: 喂，饲（养）
bite the hand who feeds you: 咬主人给你喂食的那只手
2. Black sheep 败家子
Joe is the black sheep in the family. All he does is drink, gamble and chase women.
乔是个败家子，他成天就知道喝酒，赌博，追女人。
释义：
a black sheep: 一头黑色的羊，指一个给家人带来耻辱的成员。在英文中黑代表邪恶，而白象征善良与美德。
