Back and forth 来回，往返 Back down/off 放弃，让步，退却 Back up 支持，援助 Based on 以…为基础 Be friends with 对…友好，与交上朋友 Be made up of 由…组成/构成 Because of 由于，因为 Before long 不久以后 Begin with 从…开始 Benefit from 收益于… Both…. And …. 既…又… Break away (from) 脱离，逃跑 Break down 分解，瓦解 Break in 强行进入，闯入； 打断，插嘴 Break into 闯入 Break out 突然发生，爆发 Break throught 突破 Break up 打碎，拆散 bring about 使发生 bring forward 将…提前；提议 bring out 使出现，使显明 bring up 抚养，教育；提出问题 build up 增长；积累；增强 burn out 烧掉 burn up 烧尽 by accident/by chance 偶然，碰巧 by all means 一定，务必 by and by 不久以后，将来 by far …得多 by hand 用手 by heart 牢记，凭记忆 by itself 单独地，独自地 by means of 用，凭借 by mistake 错误地 by the way 顺便提一下，另外 by turns 轮流，交替地 by way of 通过…方式
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