I know of at least two people who did the same thing.

我知道至少有两人干过同样的事。

《牛津词典》

I don't know of any vacancies in the company but I'll ask around.

我不知道公司有没有空缺，不过我会打听打听。

《牛津词典》

The whole town shall know of this!

全镇的人都会知道的！

youdao

The judge said. "The emperor has hurt no one that I know of."

VOA: special.2009.12.14

The worship practices of ancient Israel and Judah clearly resemble what we know of Canaanite and Ancient Near Eastern worship practices.

古代以色列和犹太崇拜仪式非常像,我们所知的迦南和古代近东的崇拜仪式。

耶鲁公开课 - 旧约导论课程节选

Well, I don't really know of a whole lot because I don't really research things and pay attention.

嗯，我知道的不是很多，因为我不经常关注调查这些事。

积极参与俱乐部活动 - SpeakingMax英语口语达人

"I know of at least one set of negotiations that is going on, " he said.

CNN: Taiwan's Ticking Clock

We may live and work in a knowledge economy, but do we know of our freedom.

FORBES: 42 Miles Of Echo Taps: A Memorial Day Tribute

The closest analog I know of is when you suddenly become aware of a ticking clock.

FORBES: What Its Like to Be (Momentarily) Blind