back and forth 来回地，反复地

back of 在……后边

back up 后备，支援

bare of 几乎没有，缺乏

be able to do 能够

be around 差不多

be available to sb 可用，可供

be bound to 一定

be capable of doing 能够

be concerned with 关心…，涉足…



be dying to 渴望

be fed up with/be tired of 受够了

be in hospital 住院

be in season 上市的

be in the mood to do sth 想做

be pressed for time 时间不够

be tied up with 忙于

be under the weather 身体不好

beat around the bush 拐弯没角

beat the crowd 避开人群



before long 不久以后

behind schedule 误点

bent on sth 下定决心做…

beside point 离题的，不相干的

beyond one s ability 超越某人的能力

beyond question 毫无疑问

book on reserve 须留的图书

booked up 订完了

bound for 开往

break down 抛锚



break though 突破

break up with/be through with/be finished with 和某人分手

bring about 使…发生

bring someone up to date/help someone catch up 帮某人赶上

by accident 偶然

by air 通过航空途径

by all means 尽一切办法，务必

by and by 不久，迟早

by chance 偶然，碰巧

by far 最，...得多



by hand 用手，用体力

by itself 自动地，独自地

by means of 用，依靠

by mistake 错误地，无意地

by no means 决不，并没有

by oneself 单独地，独自地

by reason of 由于

by the way 顺便说说

by virtue of 借助，由于

by way of 经由，通过