Three years ago, when the clean-up started, garbage was everywhere, but this year, the teenagers had to hunt for garbage.

三年前，当清理工作刚开始时，垃圾随处可见；但今年，青少年们不得不主动去寻找垃圾。

youdao

It started its solar enterprise three years ago but that now accounts for half of its business.

DEK三年前开始涉足太阳能行业，现在该行业已经占到业务量的一半。

youdao

It WAS only three years ago, but it feels as though aeons have passed.

不过只是三年前，但是感觉好像已经过了几十亿年。

youdao

It was recorded three years ago. But he was busy performing.

VOA: special.2009.10.09

And so it really, not the course but the idea for the course, was an evolution three years four years ago, really, when I was involved in something called the Civic Values Task Force, which was started by Princeton Project 55.

所以说，不是这个课程,而是这个课程的设想，是在三四年前形成的，当时我参加了,公民价值专责小组，由普林斯顿大学55工程发起。

普林斯顿公开课 - 人性课程节选

A document setting out rules for democratic succession was approved almost three years ago, but has been ratified by only three of the 15 countries needed to take effect.

VOA: standard.2009.10.23

But three years ago Hassannia noticed housing prices were going up faster than rental income.

FORBES: Going Commercial

But three years ago the industry was hit hard by the after-effects of the Russian financial crisis.

BBC: The sour taste of enlargement

But three years ago he halted executions, after courts found that 13 death row inmates had been wrongly convicted since Illinois resumed capital punishment in 1977.

BBC: Calls for US death penalty review