bulk [bʌlk]

ball(词根)

n.容积，大块，大部分

大多数，大部 the bulk of

eg.人口的大多数

the bulk of population

burden ['bɜːd(ə)n]

burden

n.负担，义务，责任

eg.税收负担 tax burden

举证责任 burden of proof

v.燃烧 burn [bə:n]

烧毁，烧光 burn out

烧起来 burn up

burst [bə:st](词根)

vi.爆炸;突然发生

突然哭/笑起来 burst into tears/laughter

过去式/过去分词 burst

busy ['bizi](词根)

adj.忙的，占线的

忙于… be busy doing/with sth.

生意，事务 business n.

商人 businessman n.

bust [bʌst]

burst(词根)

v.使爆裂，击破

【2013】Come out, or I'll bust the door down.

A. break B. shut C. set D. beat

【答案】A

【译】快出来，不然我就破门而入了。

but [bʌt](词根)

conj.但是，而是，除了

prep.除去

adv.仅仅，只

不是，而是 not…but

eg.这个计划带来的不是成功而是失败。

The plan caused not success but failure.

eg.除了她以外没有一个人通过测试。

No one but she passed the test.

eg.我们除了周六和周日，天天都上班。

We go to work every day but Saturday and Sunday.

eg.他只不过是个孩子。(=just)

He is but a boy.

by [bai](词根)

prep.靠近;通过……方式;被

eg.乘交通工具

by air(railway，sea，plane，bus)

渐渐地，不久 by and by

eg.不久，月亮出来了。

By and by, the moon began to appear.

【同】after a while/ soon

by the way 顺便问一下