by a bus与by bus的区别

by

bus

坐公交车，强调方式

we

go

to

school

by

bus

我们坐公交车去学校

如果是by

a

bus强调被一辆公交车所xx，强调对象

he

was

run

over

by

a

bus，他昨天被一辆公共汽车撞倒了

by prep. 被,经,由,在...之旁 ad. 经过,在近处

buy v. 购买，交易

及物动词 vt. 买；购买

get something with money

· I bought this car from Green.

我从格林手中买了这辆车。

· Can money buy happiness?

金钱能买幸福吗？

· He bought it for five shillings.

他花了五先令买它。

· She will buy me a new English dictionary tomorrow.

她明天要给我买一本新的英文词典。

及物动词 vt. 用交换或牺牲来获得

get or obtain by an exchange or sacrifice

· Peace was dearly bought.

和平是用很高代价换得的。