Finally the most important is he is at least 20 years older than me, and things changed a lot within this 20 years.

更重要的是，我们俩年龄相差至少20多年，此间宏观环境已发生了不知多少重大变化。

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Today 18 million tourists visit Venice every year, but in 20 years this number risks doubling.

VOA: standard.2009.10.27

This one I learned about in my own research about 20 years ago, and it never ceases to amaze me.

这是在我自己的研究中发现的,大概20年前，它一直让我很吃惊。

麻省理工公开课 - 固态化学导论课程节选

So a third way has emerged in the last 20 years, or 15 years or so, and it's one that seeks to avoid this dichotomy between polytheism and monotheism.

因此出现了第三种解释，在过去20年或15年间，它试图避免,将多神论和一神论一分为二。

耶鲁公开课 - 旧约导论课程节选

The land issue still being around, when you negotiated all this 20 years ago, did you expect there to have been by now much more redistribution of vital land?

BBC: News Online

That's why I'd have been reluctant to take this job 20 years ago.

WSJ: A Michigan Avenue Institution | Douglas Druick | Art Institute of Chicago | Cultural Conversation by Joel Henning

There's a team of people that have been working on this for 20 years and it grew out of science.

NPR: Rocky Mountain Activist Carole King