What she knew about his past gave her a hold over him.

她知道他的过去，所以能够控制他。

《牛津词典》

If pressed , he will admit that he knew about the affair.

如果逼问他，他就会承认对此事知情。

《牛津词典》

All that neighbours knew about the reclusive man was that he had lived in the building for about 20 years.

关于那名隐居者邻居们所知道的就是他已经在那栋楼里住了大约二十年了。

《柯林斯英汉双解大词典》

American officials say the information was made public after Iran discovered that Western intelligence agencies knew about the facility.

VOA: special.2009.09.26

The poets we'll be reading--well, they knew about science, music, politics, economics, and they presumed to talk about those things, in their poetry and out of their poetry too.

我们将要阅读的诗歌，涉及到科学，音乐，政治，经济，并且作者也认为，不论在诗歌内外，我们都将谈及这些话题。

耶鲁公开课 - 现代诗歌课程节选

They'd just say, "Oh well, we got to Egypt and we found out there are a whole lot more gods than we knew about."

他们会说，“我们去了埃及,发现了许多我们不了解的神“

耶鲁公开课 - 新约课程节选

The only thing these entrepreneurs knew about ice cream was that they liked it (a lot).

FORBES: Step 2 for a Successful Startup: Identify, Utilize, and Develop your Talents or Skills

But she knew about Mauthausen early on and here she was at this appalling place.

BBC: News

And there are some IRS officials and Treasury officials who knew about it in 2012.

NPR: With White House Bogged Down By Scandal, GOP Looks For Boost