It isn't actually known how many sites there are across Australia where rock art can be found—but unfortunately, we do know that much of the art is being lost to us.

目前还不知道在澳大利亚有多少地方能够发现这种岩石艺术；但不幸的是，我们知道有很多艺术作品正在消失。

youdao

I know a sculptor who swaps her pieces for drawings by a well-known artist.

我知道有个雕塑家用她自己的作品去换一位著名画家的画作。

《柯林斯英汉双解大词典》

I've known him for years, but I still don't know what pushes his buttons.

我已认识他多年，可还是摸不透他的脾气。

《牛津词典》

A listener named Maki would like to know if the test known as the TOEIC is popular in the United States.

VOA: special.2010.02.18

You know Bill, we shaped each other up together and known each other since we are 18, 19 years old.

你知道比尔，我们对彼此产生影响,我们算是一起成长，从18，9岁开始。

斯坦福公开课 - 微软CEO-Steve.Ballmer谈科技的未来课程节选

So you know, that's not a class that MIT is... subject MIT is typically known for, but we have everything, so...

你知道，麻省理工学院没有什么特别出名的课程，但是我们的课程涵盖一切领域。所以……

求学热十足的学校 - SpeakingMax英语口语达人

But recently an independent committee monitoring Pfizer's two big studies of the drug, know known as PF-3512676, took a scheduled look at the data.

FORBES: Pfizer Stops Developing Coley Cancer Drug

And I think that most people, I think, realise that Virgin are willing to take risks and that's one of the reasons that the Virgin brand is, is, you know, world known, and world respected, because we do take risks.

BBC: News Online

Rather than spend time identifying and correcting the most common misstatements with respect to attitudes and performance, I would like to briefly review what we know and have known for a long time about the relationship between work attitudes and performance.

FORBES: Engagement and Performance: Old Wine in a New Bottle