I don "t know why we picked her."

我不知道我们为什么挑选了她。

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

And it makes you want to go get that insurance. I don't know why, but it does.

这让你想去买这家保险。我不知道为什么，但这就是这样。

广告泛滥 - SpeakingMax英语口语达人

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We don't know why, but there is something stylishly simple, yet futuristic about it.

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"I don't know why the club didn't stop this, " he said, referring to the rumors.

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