I'm not clear about this matter, so I had better keep quiet.

我对这个问题不清楚，只能不赞一词。

《新英汉大辞典》

Are you clear about the arrangements for tomorrow?

你清楚明天的安排吗？

《牛津词典》

It is important to be clear about what Chomsky is doing here.

明确乔姆斯基在这干什么很重要。

《柯林斯英汉双解大词典》

That is why we are here today. I want to be clear about this.

VOA: special.2009.11.13

You get clear about the kinds of questions we've just been asking about the badness of death, whatever that is.

你弄明白我们所问的关于死亡的坏处的,这类问题，不管是什么。

耶鲁公开课 - 死亡课程节选

He is clear about that. But then he goes on to say, and that's the natural right to property.

他非常明确这点，但之后他又说，而且财产权是自然权利。

耶鲁公开课 - 公正课程节选

But let's be clear about one thing: The museum business is no ticket to easy street.

FORBES: Un-private Houses

Ambassador SATTERFIELD: Well, again, Secretary Gates, Secretary Rice have been very clear about this.

NPR: Negotiating America's Future in Iraq

And Gillian, too, is clear about the benefits to the youngsters of taking part.

BBC: Devon - Putting prison life on the stage