每天30个单词以防单词记忆退化

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和某人分手be through with be finished with
bring about 使…发生
bring someone up to date帮某人赶上help someone catch up
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 较,...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...方法