Mid-aged teachers are backbones.

中年教师是体育科研的骨干。

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When he ran to the door, there stood a mid-aged man with a lantern in his hand.

当他向房门跑去时，那儿正立着一位手里拿着一盏灯笼的中年男人。

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Today, I was stopped at a traffic light when a mid-aged homeless woman asked me for change.

今天，当一个无家可归的中年妇女向我乞讨的时候我在红绿灯前停下了。

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What if university-age entrepreneurs are psychologically more scalable or flexible than mid-aged counterparts?

FORBES: Student Entrepreneurship Is Humming At Elite Universities

The beauty of this film is that unlike others involving middle-aged men, a mid-life crisis and a woman young enough to be his daughter, theirs is a purely platonic relationship.

BBC: NEWS | Entertainment | Review: Cruise and Coppola explore Japan's culture

In addition, poverty among people aged 65 and older has fallen from nearly 30% in the mid-1960s to just 9% in 2011.

FORBES: Good News: Today's And Tomorrow's Retirees Are Better Off Than You Think