burn up 烧旺起来
burst into laughter 突然笑起来
burst out laughing 突然笑起来
on business 因事,因公
mean business 是当真的
be busy with 忙于
but for 倘没有,要不是
button up 扣,扣紧钮扣
buy off 收买
buzz off 急忙离去
by and by 不久以后,将来
by and large 总的来说,大体上
by oneself 单独;独自,自行
by far 得多;最最
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