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To keep cool people had their hair cut with shaven heads.

为了保持凉爽，人们把头发剃成光头。

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The students are often told to keep cool by teachers when facing emergencies.

老师经常告诉学生遇到紧急情况要保持冷静。

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But for many of the world's poor, finding a good way to keep food cool is difficult.

VOA: special.2009.02.09

There was a new system of liquid nitrogen to keep the pilot cool and to resist the crushing force of gravity at high speeds.

VOA: special.2010.07.07

And this may be cool enough to keep foods fresh, at least for a short time.

VOA: special.2009.11.30

As we sit and watch, a desert elephant storms up, blasting itself with a trunkful of dust to keep cool.

BBC: The ghostly shore of Namibia��s Skeleton Coast

But a lot of space is occupied by a massive fan that the supersonic chip needs to keep cool.

CNN: Life at One Gigahertz

And for that, I think Bezos has inherited the ability to keep cool in the midst of complete corporate failure, just like Jobs.

FORBES: Apple And Amazon Earnings Show Once Again Jeff Bezos Is Steve Jobs' True Heir