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When she was about four years old, she heard her mother struggling to play a piece of music on the piano.

VOA: special.2010.04.09

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

Oh, that goes actually way back time when we were like little kids like, four years old,

哦，那其实要追溯到我们是小孩子的时候了，四岁的时候，

和朋友一起逛洛杉矶 - SpeakingMax英语口语达人

In the last 12 months it unveiled under a dozen new smartphones when four years ago it would have rolled out twice as many.

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Lastly, if all goes well, Mr Aznar might reasonably expect a top international post when his four years are up.

ECONOMIST: Spain

Cyan was managing IronPort's blacklist of spammers when they met four years ago at a friend's poker night.

FORBES: You Get What You Pay For