I don' t know if Sam will come.

我不知道萨姆是否会来。

youdao

We don"t know her marital status, whether or not she has children.

我们不清楚她的婚姻状况，也不知道她是否有孩子。

youdao

In fact, scientists don? T know what it is.

实际上，连科学家们都不知道暗物质究竟是什么。

youdao

But we certainly didn't have goals. I don't know if we had ever heard of Grammys at that point.

VOA: special.2010.04.19

if we can't think what system it belongs to, that's tantamount to saying we really don't know what it is.

我们就不知道它从属于哪个符号系统，我们就不能认识它了。

耶鲁公开课 - 文学理论导论课程节选

And you've asked several people on the street . "I just can't get there! I don't know where I'm going!" and

你在街边向几个行人问路。“我没法找到目的地了，我不知道该怎么走！”

How long课堂 - SpeakingMax英语口语达人

" Her backup singers in the Gospel Queens plead ignorance: "I don't know, I don't know.

NPR: Naomi Shelton Knows What You've Done

But they don't know where to go and we don't know anything about them.

NPR: Activists Host Darfur Observance Day in L.A.

"We don't know where they came from, we don't know who contributed, " he said.

CNN: McCain: Race won't determine outcome of election