To understand why they are doing it, it is necessary to know where they are coming from.

要理解他们为什么这样做，有必要知道他们的想法。

《柯林斯英汉双解大词典》

Don't you want to know why they are so successful?

你难道不想知道他们为什么这么成功吗？

youdao

They want to learn why they are so strong and elastic.

他们想知道它们为何如此坚硬和有弹性。

youdao

"It should be clear understandable what they are doing, why they are doing it, and what all their decisions are based on.This is one.

VOA: standard.2010.04.15

There are two reasons, for the most part, why they are coming: they're coming to find poems that will be relevant, equal to the occasion of a death or a marriage.

主要有两个原因能解释为什么，人们访问美国诗人协会网站：,人们是来寻找一些诗歌，一些有关,死亡与婚姻等的诗歌。

普林斯顿公开课 - 人性课程节选

So, can you tell us about famous attractions in New York City and why they are famous?

那么，你能跟我们讲讲纽约著名的景点以及它们为什么有名吗？

纽约的景点 - SpeakingMax英语口语达人

However, Ospreys showed why they are the current title holders by fighting their way back.

BBC: Magners League: Ulster 27-26 Ospreys

If you cannot figure out why they are wrong, then you need to change your opinions.

FORBES: Malpass to Bernanke: Hike! Hike! Hike!

Sometimes you have to wonder why they are played, especially when they come before important games.

BBC: Lundekvam backs friendlies