“但为什么？”他插嘴问。

'But why?' he interpolated.

《牛津词典》

和我们分享你的想法吧！我不确定，但为什么会有人这么做呢？

Share your thoughts with us! I'm not sure, but why would anyone do so?

youdao

“塞纳托尔吃了两次饭？”爸爸问，“但为什么他总是看起来很饿？”

"Senator was fed twice?" Dad asked, "But why did he always seem hungry?"

youdao

And I don't know why, but since time immemorial that is the way computer scientists have drawn trees.

叶子是在最下面的，我不知道为什么,但从记事以来他们就是这么画树的,这也许就是为什么我们。

麻省理工公开课 - 计算机科学及编程导论课程节选

That is why this says atomic number, but for most intents and purposes we can say this could be atomic mass.

那就是为什么这里说原子序数，但如果没有意图和目的,我们就说是原子质量。

麻省理工公开课 - 固态化学导论课程节选

Nobody really believed he still had these sympathies, but the whole question was, why didn't he fess up?

没有人真的相信他仍怀有这些同情，但问题是，他为什么不坦率地承认？

耶鲁公开课 - 文学理论导论课程节选