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be in the dark 蒙在鼓里
be on a diet正在节食
before long 不久，很快
behind the time(s)落后于时代
believe it or not信不信由你
bit by bit逐步的，慢慢的
break down 坏了，出故障
break up分手
by all means 当然
by and by很快
be sick/tired of 厌恶，厌倦
be up to胜任，能做
burn up 使愤怒
break new ground创新
be all ears 洗耳恭听
be all eyes目不转睛
by the book 照章办事
below the mark不够水平,不合格
be in another world 精神恍惚,魂不守舍
break the ice打破僵局,打破沉默
beyond the reach of sb.超出某人能力之外
Boys will be boys!本性难移
bite off more than I can chew 贪多嚼不烂
big potato大人物
burn a hole in one’s pocket 花钱如流水
break a leg大获全胜
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