It only lasted a couple of years, as far as I know.

据我所知，它仅维持了几年。

《柯林斯英汉双解大词典》

Human curiosity demands that we know actual age in years.

人类的好奇心驱使我们了解实际年龄。

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Scientists know that some of the Bristlecone pines in northern California are also more than four thousand years old.

VOA: special.2009.05.12

But it was there for over a thousand years, and we now know things to be a little different.

但是，它存在了超过1000年，我们现在知道的事情有点不一样。

麻省理工公开课 - 固态化学导论课程节选

So it was like a big shock to me because after five years, I thought I know the language.

所以，这对我来说，就是一个很大的打击，因为五年的学习以后，我以为我掌握这门语言了。

语法和语调是关键 - SpeakingMax英语口语达人

As middle-class Americans who have seen their real incomes decline in the last four years know, that's a huge number.

WSJ: Review & Outlook: The Immigration Windfall

Accountants who audit a company for years know more about it, says Don Moore, a psychologist at the University of California, Berkeley, who has studied conflicts of interest.

WSJ: The Intelligent Investor: One Cure for Accounting Shenanigans

As you know that in Singapore, over so many years we know we are worried, we're scared.

CNN: Interview with Jack Neo