But sometimes, I find it is hard to tell others when I don? T like what they are doing.

但有时候，我发现很难告诉别人我不喜欢他们的所作所为。

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

No, I 'm sorry, I don' t know what time it will finish.

不，对不起，我不知道会议什么时候结束。

youdao

"Of course,we don't know what doses they've received, but the only persons at risk of acute radiation effects are the workers."

VOA: special.2011.03.16

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

because there's, I don't know what to say, over 50, 60 colleges, you know, that are recognizable in California

因为在加州有，我不知道怎么说，有五六十多所众所周知的大学，

加州的大学 - SpeakingMax英语口语达人

So it's important to get everybody participating, and a certain number of people in that 42 percent we were talking about don't even know if this is necessary, don't know that it applies to them, don't know what it entails for them, don't know what the advantages are for themselves.

NPR: Nearly Half The Country Doesn't Know Health Law Exists

Don't say what you don't know for sure until it's finally decided.

CNN: Five things we learned from the Benghazi hearings

One of the main problems with looting is that if a site is undiscovered, you simply don't know what you don't know.

CNN: Opinion: Illegal antiquities trade funds terrorism