It may be that some have them already, but we cannot be sure.

也许有些人已经拿到了，但我们不能确定。

youdao

He almost certainly attended the Grammar School in the town, but of this we cannot be sure.

几乎可以肯定，他是在镇上念的文法学校，但对此我们没有绝对把握。

youdao

Granting that he did say so, we cannot be sure what he really meant.

假定他那样说了，那也不一定是他的本意。

youdao

"And while we will continue to do everything we can, we cannot be sure what the future will hold, but we are doing our absolute level best."

VOA: standard.2009.07.29

The trouble is that not much from that period survives and particularly not organic material, so we cannot be sure.

NPR: Looking at the World Through Beer Glasses

That is almost certainly true, even though we cannot be sure what form that test will take or from which quarter.

CENTERFORSECURITYPOLICY: Will Obama 'go to' defense?

"Until we find out what happened we cannot be sure that the second wheel will not suffer similar problems, " a spokeswoman said.

BBC: Cambridgeshire composter breakdown costs ?60,000 a week