back out 退出

baggage counter 行李柜台

basketball game 篮球比赛

basketball practice 篮球训练

bathing suit 游泳衣

be a mystery to someone 对某人来讲是个谜，不明白

be a total bore 特没意思

be about to 就要做……

be absent from school 缺课

be absorbed in 专注于，被……吸引

be accustomed to 习惯于

be acquainted with 和……认识

be addicted to 对……上瘾

be all in a day's work 日常生活的一部分

be attached to 对……有感情

be backed up （交通）堵了；（活）拖下来了

be behind in 落后

be behind schedule 晚点

be better off 会更好的

be bound for 去……地方

be bound to 一定会，必然会

be burned up 生气

be capable of 有能力做……

be critical of 对……持批评态度，批评……

be done (菜)熟了

be done (with) 完成，做完了

be finished 做完了

be finished with 做完了，完成了

be free of 摆脱，清除

be free to 自由去做……

be good with 擅长

be hard on 对……苛刻

be hard up for 缺少

be head and shoulders above 比……高出很多

be headed for 去……地方

be in a mood for something 有心情做某事

be in luck 有运气，幸运

be in the dark 蒙在鼓里，不知道

be known to 为……所熟知

be made of money 是钱做的；很有钱

be off caffeine 不能沾咖啡因

be off to 去……地方

be on a diet 正在节食

be on loan to somebody 借给某人

be oneself 显得自然

be one's old self 恢复常态

be onto something 想到点儿什么东西，有些想法

be overwhelmed 招架不住

be overwhelmed with 忙着做

be prepared for 为……做好准备

be relevant to 和……相关

be responsible for 对……负责任

be right on target 正中靶心，讲得很到位

be sensitive to 对……敏感

be sick of 对……感到厌恶

be slated to 提名……作候选人；内定……的职务

be stuck 卡住了，动不了；被困住了，被难住了

be suitable for 合适做……

be supposed to 应该

be swamped with 忙于……

be through (with) 做完……

be tied up 被占用

be tied up in 忙于做……

be up to somebody 由某人来做决定

be used to 对……习惯了

be worth the wait 值得等

bear up well 表现得很坚强

before long 不久，很快

begin one's diet 开始节食

behind the times 落后于时代

believe in 相信

believe it or not 信不信由你

belong to 属于

benefit concert 慈善音乐会

better luck next time 下次好运

better than half 一多半

birth certificate 出生证明

birthday present 生日礼物

bit by bit 一点儿一点儿，逐步地，慢慢地

bite off more than one can chew 贪多嚼不烂

black and blue 青淤的；淤血的

black coffee 黑咖啡

boil down to 归结为

book bag 书包

book up 订光（常用于被动语态）

box office 售票处

break down 坏了，出故障

break even 收支相抵

break new ground 有了新的突破

break up 散了；（男女朋友）吹了

bright sides 光明面

brighten one's spirits 使情绪好起来

bring somebody up-to-date on 告诉某人最新的消息

bring……along 一块带来

broad claims （论文中）宽泛的论点

broken string 弦断了

brown paper 牛皮纸

brush up on 重温，再练（荒疏的学业、技术）

bulletin board 广告栏，布告栏

bump into 碰到某人，撞上某人；撞上……

burn a hole in one's pocket 有钱就会在口袋里烧个洞，有钱存不住

burn the midnight oil 点灯熬夜

burn up 生气

bus fare 公共汽车票钱

bus schedule 公共汽车时刻表

bus station 汽车站

bus tour 乘公共汽车旅游

busy signal （电话）占线的声音

by air 乘飞机

by all means 当然

by accident 不小心，偶然

by and by 很快

by leaps and bounds 跳跃地，非常快地

by oneself 自己一个人，单独