I don "t know why we picked her."

我不知道我们为什么挑选了她。

youdao

If you don "t know when you will be back, explain this and the reason why you don" t know.

如果你不知道什么时候回来上班，那就明确说明，并解释不能确定的原因。

youdao

And I bet the reason why you "re not pursuing something better is because you don" t know what you "d rather do."

而且我认为你不去追求更高目标的原因是因为你不知道什么是更应该做的。

youdao

I don't know why I do it. I just do it."

VOA: special.2009.07.04

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

But for me, I like to look at something and just say, "I like this. I don't really know why though."

但对我来说，我喜欢看着某个东西，然后说，“我喜欢这个。但我也不知道为什么。”

关于现代美术 - SpeakingMax英语口语达人

Don't know why I ever thought I needed, don't know why I thought I needed, don't know why I ever thought I needed you.

NPR: Dustbin Bands: The Surreal McCoys

"I don't know why they don't just get Jet Skis, " said Tracy Korbel, a 46-year-old Texas native, who has lived in Minnesota for a dozen years.

WSJ: Snowmobile Riders Race Over Water on Minnesota Lakes

We don't know why certain projects get earmark funds and why other projects don't.

CNN: Critics question Obama's pledge to end 'pork'