她保持了三年的世界冠军头衔。

She held the title of world champion for three years.

《牛津词典》

这位画家至少具有三年的工作经验。

The painter has at least three years of working experience.

youdao

这是一项为期三年的灌溉工程。

It was a three-year water irrigation project.

youdao

It's great idea with a lot of hard work and then you work at it for year, two years, three years, four years, five years, six years, seven years, eight, nine, 10.

勤奋的工作，一年两年，三年,有或者更多，甚至10年，是很好的想法。

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

The longest piece that I have been working on has been developed over the last three years.

我一直在写的一个最长的剧本已经写了三年了。

灵感从何处来 - SpeakingMax英语口语达人

It has a half-life of approximately three years at which time it stops decaying.

它生命的一半是三年,在三年的时候，它就停止衰亡。

麻省理工公开课 - 固态化学导论课程节选