build up 逐步建立

burn down 把…夷为平地

burn oneself out (因过劳而)筋疲力尽

burn out 烧坏；烧尽，筋疲力尽

burn up (炉火等)烧旺起来

burst into 闯入；突然发作

burst into laughter 突然笑起来

burst out laughing 突然笑起来

burst up 爆炸；失败；突然发怒

burst upon 突然来到

bus station n公共汽车站

bus stop n。公共汽车站

but for 倘没有，要不是

button up 扣，扣紧钮扣

buy off 收买

buy out 出钱使(某人)放弃地位

buy up 全买；尽可能买进

buzz off (俚)急忙离去

by accident 偶然

by air (bus,train,ship)乘飞机（公共汽车，火车，轮船）by all means 尽一切办法；一定

by all nerves 高度不安，神经紧张

by and by 不久以后，逐渐地