youdao

I'm not sure why I started climbing.

我不能确定为什么我开始攀登。

youdao

I'm not sure why... maybe it's fear.

我不肯定为什么，可能是因为害怕吧！

youdao

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

VOA: standard.other

I'm not sure why it's not S for save but it's write out and that means save.

我也不明白为什么不用S代表“保存“而是用“写出“,“写出“也就是“保存“啦。

哈佛公开课 - 计算机科学课程节选

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

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

NPR: 'iPhone' Tops Google Zeitgeist List

We're not there yet (and I'm not sure why we'd want to get there).

FORBES: 'The Road Ahead' Is Here

I'm not sure why it should matter, but I always love a good "best of" list.

NPR: The Best Living Songwriters