Three year ago, Cambridge University contacted China's State Education Commission concerning a cooperative effort to establish the BEC in China.

三年前，剑桥大学与中国国家教委一起共同合作在中国建立BEC 测试的适宜。

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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。

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The United States has lost more than three and a half million jobs since the recession began more than a year ago.

VOA: special.2009.02.28

After decades of relatively unspectacular growth, compared to the east Asian economies, India's economy suddenly took off three or four years ago, growing at 8% or more a year.

经历了几十年的相对高速发展后，与其他东亚经济体相比，印度经济三或四年前突然开始腾飞,以每年8%甚至超过%,8%的速度增长。

普林斯顿公开课 - 国际座谈会课程节选

Three months ago, the I.M.F.predicted a small growth for this year.

VOA: special.2009.04.24

John Luciw's family moved to the suburban district of Discovery Bay, on Lantau island three year ago, in the belief that the air quality is better there.

BBC: Pollution threatens Hong Kong's competitiveness

It was decreasing by 7.9 percent per year three years ago and continues to drop 2.7 percent in the current year.

FORBES: Do Marketers Know What They Want From Social Media?

The retail sales growth trend continued on a steady decline in February, reaching an almost-flat figure of 0.1% growth in the three month period compared to the same three month period a year ago.

FORBES: For Bond Investors, Sentiment Shifting On Brazil Rates