why

英 [waɪ] 美 [waɪ]

adv.

为什么？;(用于问句)为什么，为何;(反问，表示不必)何必;(说明理由)为什么，…的原因

int.

(惊讶、不耐烦等时说)哎呀，呦，哟，嗨

n.

原因;理由;说明;难解的问题

复数

whys

牛津词典

adv.

1

（用于问句）为什么，为何

used in questions to ask the reason for or purpose of sth

Why were you late?

你为什么迟到？

Tell me why you did it.

告诉我你为什么这样做。

‘I would like you to go.’ ‘ Why me? ’

“我希望你去。”“为什么要我去呢？”

(informal) Why oh why do people keep leaving the door open?

人们到底为什么总敞着门呢？

2

（反问，表示不必）何必

used in questions to suggest that it is not necessary to do sth

Why get upset just because you got one bad grade?

何必因为一次成绩不好就想不开呢？

Why bother to write? We'll see him tomorrow.

还费事写信干什么？我们明天就见到他了。

3

（说明理由）为什么，…的原因

used to give or talk about a reason

That's why I left so early.

这就是我早早离去的原因。

I know you did it─I just want to know why.

我知道这是你干的，我只是想知道为什么。

The reason why the injection needs repeating every year is that the virus changes.

每年需要重新注射的原因是这病毒经常变化。