对他为什么这么做妄加猜测毫无用处。

It is useless to speculate why he did it.

《牛津词典》

军队还没有提供对该事故如何发生以及为什么发生的解释。

The army has not yet proffered an explanation of how and why the accident happened.

《柯林斯英汉双解大词典》

他对电梯为什么会卡住仍给不出更多解释。

He still could not throw any further light on why the lift could have become jammed.

《柯林斯英汉双解大词典》

So for example I defined p, remember back over here, as a Cartesian point, but I can actually ask for its polar form.

我可以要求返回它的极坐标形式，这里对我是可访问的，好，这很棒，请再记另外一个为什么。

麻省理工公开课 - 计算机科学及编程导论课程节选

I said that if I was really hygienic, and you can now wonder about how often do I shower?

但是这真的很棒，对不对？,那么为什么我要说这些呢？,我说过如果我真的很讲卫生的话？

麻省理工公开课 - 计算机科学及编程导论课程节选

You didn't know who wrote it, where, when, how, why, and someone says to you, "I want you to draw some conclusions about that piece of writing.

你不知道是谁，在哪里，什么时间，怎么样，为什么要写,然后你被要求对篇文章，做一个总结。

耶鲁公开课 - 旧约导论课程节选