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 know of scientists who conduct marine life surveys and identify new species every time they go out on a dive.

我知道有科学家在从事海洋生物调查，并在每次潜水时都能发现新的物种。

youdao

I believe, from what I know of him, he was a bit of a rake. We bivouacked together on and off for nearly two years.

另外以我对他的了解，这是个有点浪子气息的家伙。我们断断续续地在一起露营了近两年。

youdao

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

VOA: special.2009.12.14

There is obviously no magic solution to this question but the best answer I know of is Socrates.

这个问题,没有神奇的解答,但我认为最佳的答案是苏格拉底。

耶鲁公开课 - 政治哲学导论课程节选

The most famous alumni from Columbia Law that I know of is Paul Robeson.

我知道的哥伦比亚法学院最有名的校友是保罗•罗伯逊。

哥伦比亚的第一印象 - 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

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

FORBES: What Its Like to Be (Momentarily) Blind

"Every company I know of is interested in this, " says Plexxikon Chief Executive Peter Hirth.

FORBES: Magazine Article