The competition was first held in two thousand two and has taken place every two years since two thousand five.

VOA: special.2009.10.27

It's because over the last two years since I last taught it, I've done a lot work in the area of silence.

因为上次课程结束后到现在的两年，我做了大量关于安静的研究。

哈佛公开课 - 幸福课课程节选

What's happened actually if we base it in the last 25 years since the early '80s We've just had two recessions and they've been very mild by historical standards and...two--now three long expansions in between.

实际上是什么情况呢,80年代初期以来，这25年当中,我们只经历过两次经济衰退,而且在历史上算是相对轻微的,其间则是两，三次长时间的经济增长。

斯坦福公开课 - 经济学课程节选

It has been more than two years since he has been to a hospital emergency room because of asthma.

VOA: special.2009.07.28

Then, almost two years since announcing his candidacy for America's highest office, Mr. Obama began the work of president.

VOA: special.2009.01.24

The work was first performed in Germany in two thousand to mark two hundred fifty years since the death of the composer Johann Sebastian Bach.

VOA: special.2010.07.19

Lincoln noted that seventy-two years had passed since the first president was inaugurated.

VOA: special.2009.07.30

His South West Africa People's Organization, which has governed Namibia since independence nearly 20 years ago,is expected to win a two-thirds majority in parliament.

VOA: standard.2009.11.27