Love brought him to the Pacific Northwest about eight years ago.

VOA: standard.2010.01.22

It's a fully implantable artificial heart, and it was introduced about seven or eight years ago now.

它是一个完全植入式人工心脏,它是在七八年前发明

耶鲁公开课 - 生物医学工程探索课程节选

The Aurignacian culture began about forty thousand years ago and ended about twenty-eight thousand years ago.

VOA: special.2009.08.18

More people moved into the Pajarito Plateau area about eight hundred years ago.

VOA: special.2010.07.05

Humans started to domesticate wild cows about eight to ten thousand years ago.

VOA: special.2009.05.05