Experts still do not know much about this woman and her famous smile.

VOA: special.2010.06.23

Not only is it inevitable that you're going to die; not only do some people live longer than others, you don't know how much more time you've got.

你会死去这不仅是不可避免;,不仅有些人活得比另一些人久，你也不知道自己还剩下多少时间。

耶鲁公开课 - 死亡课程节选

That's not as much in my area of specialization, but I do know that

这不太属于我的专业领域，但是我知道

对于未来的技术 - SpeakingMax英语口语达人

"People do not know much about China, especially the latest development.

VOA: special.2010.02.04

Let us say I want to sell my car but I do not know exactly how much it is worth.

VOA: special.2009.04.12

"As much as I like Barack Obama, I just do not know that he has done enough to warrant such an honor."

VOA: standard.2009.10.09