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 最，……得多
ask for the moon 异想天开
at a loss 茫然，不知所措
at a time 一次，每次
at all costs 不惜一切代价
at all events 不管怎样，无论如何
at all times 随时，总是
at all 丝毫(不)，一点也不
at any rate 无论如何，至少
at best 充其量，至多
at first sight 乍一看，初看起来
at first 最初，起先
at hand 在手边，在附近
at heart 内心里，本质上
at home 在家，在国内
at intervals 不时，每隔……
at large 大多数，未被捕获的
at last 终于
at least 至少
at length 最终，终于
at most 至多，不超过
at no time 从不，决不
at one time 曾经，一度;同时
at present 目前，现在
at someone's disposal 任……处理
at the cost of 以……为代价
at the mercy of 任凭……摆布
at the moment 此刻，目前
at this rate 照此速度
at times 有时，间或
aware of意识到
all the same 仍然，照样的
all the time 一直，始终
angry with sb. at/about sth. 生气，愤怒
anxious about/for 忧虑，担心
anything but 根本不
apart from 除……外(有/无)
appeal to 吸引，申诉，请求
applicable to 适用于
apply to 适用
appropriate for/to 适当，合适
approximate to 近似，接近
apt at 聪明，善于
apt to 易于
around the clock 夜以继日
as a matter of fact 实际上
as a result (of) 因此，由于
as a rule 通常，照例
as far as …be concerned 就……而言
as far as 远至，到……程度
as follows 如下
as for 至于，关于
as good as 和……几乎一样
as if 好像，防腐
as regards 关于，至于
as to 至于，关于
as usual 像平常一样，照例
as well as 除……外(也)，即……又
as well 同样，也，还
ashamed of 羞愧，害臊
aside from 除……外(还有)