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》

I'm not clear where she lives.

我不清楚她住在哪儿。

youdao

I'm not clear about that.

我对那一点不明白。

youdao

I'm not clear that that kind of knowledge gives a whole lot of value to your life.

我不是很确定,这种知识会给你的生活带来多少价值。

耶鲁公开课 - 死亡课程节选

Now in this case, it's clear that I'm not only saying this function takes an input, I also have to give that input a name.

在这种情况，很清楚的,我不只是说明这个函数有一个输入，我还要给那个输入一个名字。

哈佛公开课 - 计算机科学课程节选

I'm just not being clear.

我只是没有表达清楚。

耶鲁公开课 - 死亡课程节选

What I'm not clear about is that even if Paulson did select the securities he wanted to bet against, why is that illegal?

CNN: Case against Goldman is 'very weak'

I'm not clear whether it was intended as an ironic statement.

WSJ: Senior Living It Up

Now, before we dig much deeper, I want to make it clear that I'm not here to discuss the merits of stock Android versus the Sense environment.

ENGADGET: Editorial: All I want for Christmas is a new HTC Nexus Mobile