The reactor cooling system re-circulates water, so its return would simplify recovery operations.

反应堆的冷却系统将水不断进行循环，冷却系统恢复后可以简化复原工作。

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Heated blood circulates through the thin ear tissue and cools as it does so.

热的血液循环通过薄的耳组织得到降温。

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So this is the first thing that the air conditioner does: it circulates the air.

因此，这是空调要做的第一件事：循环空气。

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The cell that's producing the signal produces enough of the molecule so that it enters the bloodstream, it circulates throughout your body, eventually it reaches a cell at a great distance, which has a receptor for that ligand and the signal gets received.

发出信号的细胞产生信号分子,数量十分充足 能够进入到血液中,信号随着血液流遍全身,最终到达较远处的细胞,在这些细胞上有与配体配对的受体,信号被细胞接收

耶鲁公开课 - 生物医学工程探索课程节选

By definition, people need it, and so it re-circulates in the economy and it has an effect of boosting aggregate demand and helping the economy grow.

WHITEHOUSE: President Obama Speaks to Town Hall Meeting at University of Maryland | The White House