She held back, not knowing how to break the terrible news.

她踌躇着，不知如何说出这一可怕的消息。

《牛津词典》

She held back, not knowing how to tell him the bad news.

她踌躇着不知道应该怎么把这个坏消息告诉他。

youdao

Edwin was just smoking a cigarette, not knowing how to respond.

埃德温正在抽烟，不知该如何回答。

youdao

Whatever you think those are. Here, you might imagine different people disagreeing about-- oh, but throw in something--but if what you want to do is write the great American novel, then you've got the experience of staying up late at night not knowing how to make the plot work out, crushing pieces of paper and throwing them away.

你能想到的都在里面，可能有人不同意-,插入某某东西，比如你想,创作最伟大的美国小说，于是你获得熬夜的体验,纠结于如何构建情节，撕碎稿纸，扔在一边。

耶鲁公开课 - 死亡课程节选

learned English, came here not knowing really anything other than "Hi, how are you?"

学了英语，我刚来的时候，除了“嗨，你好吗？”什么也不会。

第二外语，英语 - SpeakingMax英语口语达人

So it's not just knowing what genes or figuring out ways to look at gene expression, it's figuring out how this expression of key genes affects the fate of the individual.

所以我们不仅仅是要了解那些基因能致病,也不仅是要弄明白基因的表达方式,更要搞清楚这种关键基因的表达,如何影响个人命运

耶鲁公开课 - 生物医学工程探索课程节选

He also joked about members of the Southeastern Conference not knowing how to read or write.

WSJ: Ohio State Board Warns President Over Comments

The hardest part, of course, is not knowing how long this is going to carry on.

BBC: Besieged Misrata: Seaside picnics, laughter and rockets

He met McCain after being captured, not knowing how their lives would intertwine later.

CNN: FTC commissioner on the Web privacy debate