我不确定我可以。

I'm not certain I have it.

youdao

我并不确定是什么使我爱上所有未知和隐晦的事情，但我在那方面的热情一直保留到了今天，这当然也可以看作是创建榜单网站的最大的动机。

I am not sure what drew me to love all things obscure and unknown, but that passion remains with me to this day -and can certainly be considered the greatest motivation for making Listverse.

youdao

我不确定现在我是否可以说胜利来临。

I'm not sure I'm ready to declare victory yet.

youdao

.. I guess, unfortunately, it is for... there needs to be a number put somewhere, like, I'm not sure what that number would be, but I do agree that there could possibly be a number put on the human life.

我觉得，不幸的是。,有时确实需要标价，不过我不确定具体数字，但我确实认同,人的生命也许可以被标价。

耶鲁公开课 - 公正课程节选

I'm not sure about the other schools, but I know FIT, we get in free.

我不确定其他学校的情况，但是我知道FIT的学生可以免费进去。

学生们的艺术热情 - SpeakingMax英语口语达人