你为什么这么神神秘秘？为什么不直截了当地告诉我？

Why are you so mysterious? Why don't you tell me outright?

《柯林斯英汉双解大词典》

为什么？爸，你告诉我为什么！

Why? Dad tell me why!

youdao

为什么？ 爸，你告诉我为什么！

Why? Dad, tell me why!

youdao

And she was able to tell me that they can divine from the hits on their site why people are coming to that site.

她告诉我，他们可以从网站的点击次数,推断出人们为什么访问他们的网站。

普林斯顿公开课 - 人性课程节选

Can you give me, say, three or four reasons why what we're about to hear differs from what we just heard?

你能告诉我三四个原因吗,为什么我们马上要听到的音乐与刚听过的不同

耶鲁公开课 - 聆听音乐课程节选

I would think that it would approach inifinity, and I would need to think about it and get back to you in terms of why we don't actually hit it and see something with an infinite wavelength.

我会认为波长会接近无穷大，而且我需要考虑一下,然后返回来告诉你,为什么我们没有说对,为什么我们没有看到,无穷大波长的东西。

麻省理工公开课 - 化学原理课程节选