big shot 大人物，大亨

　　He is a big shot in our little town.

　　black sheep　败家子，害群之马

　　Every family has a black sheep.家家有本难念的经。

　　black and blue　遍体鳞伤

　　The thief was caught of red-handed and beaten black and blue.那个小偷当场被抓住并被打得青一块紫一块的。

　　black and white　白纸黑字

　　The proof is in black and white and the murderer has no any excuses.证据确凿，凶手再也无话可说。

　　blind alley　死胡同

　　You are heading into a blind alley.你正在钻牛角尖。

　　blow hot and cold　摇摆不定

　　This guy seemed to have no own idea.He always blew hot and cold.这家伙好象没什么主张，总是摇摆不定。

　　blow one's own trumpet　自吹自擂

　　Don't blow your own tumpet.Let us see what on earth you can do.不要自吹自擂了，让我们看看你到底能做什么。

　　born with a silver in one's mouth　出生在富贵人家

　　He is born with a silver in one's mouth.他是含着金钥匙出生的。