Sure Why not?

当然，为什么不？

youdao

youdao

He prowled around the room, not sure what he was looking for or even why he was there.

他在房间里悄悄地走来走去，不知道自己在找什么，甚至不知道自己为什么在那里。

《柯林斯英汉双解大词典》

Sure. Why not? A few of us were leaving.You could take their place.

VOA: standard.other

You feel physiologically aroused but you're not completely sure why, and you have to make up an explanation for it.

你感觉到性觉醒,但是不能确定是什么原因，你不得不给出一个解释。

耶鲁公开课 - 心理学导论课程节选

so this is why I'm not, I'm not a hundred percent sure

所以我也不能确定，

关于宿舍制度 - SpeakingMax英语口语达人

William Greenwood, property manager at Bodnant Garden, said no-one was sure why dogs had not been allowed in until now.

BBC: Bodnant Garden allows in pet dogs for the first time

But Democrats say they will continue this line of debate, and point to Bush's admission at a Monday news conference that even he was still not sure exactly why a required form disclosing a major stock transaction 11 years ago was not filed until eight months after the deadline.

CNN: Bush to propose jail time for corporate misconduct

Number one is a master cleanse, number two is a Ratatouille, which I'm not sure why.

NPR: 'iPhone' Tops Google Zeitgeist List