Chocolate is a promising substance for malaria research because it binds with cholesterol and takes it out of circulation.

对疟疾研究来说巧克力是一种很有前途的物质，因为它能抑制胆固醇的升高同时能把它带出循环系统。

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Out of the 20 channels in the channel and collateral system, only 5 enter the brain, with unclear circulation pathway in the brain.

在经络系统的20经脉中，入脑者只有5条，脑内循行路径也很模糊。

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According to the US General Accounting Office, two-thirds of pennies are out of circulation, with many of them disappearing almost the moment they reach the public.

BBC: The US penny: Should it be scrapped?

In practice, this would mean taking millions of notes out of circulation, following a quiet campaign by oppositionists to mark them with anti-regime slogans.

ECONOMIST: Iran's increasing turmoil

When they approached the circulation desk to check it out, the librarian looked at them with a touch of respect in his eyes.

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