所以，这是个简单的循环，气体就从这儿来，这是氦气现在，正在流通,通过反应堆，进入到气体涡轮里,这是个气体涡轮，不是蒸汽涡轮。

So it's a simple cycle where the gas from, and this is helium gas now, is circulated through the reactor and goes right to the gas turbines, and it's a gas turbine not a steam turbine.

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在自然的碳循环中，二氧化碳于陆地、海洋和大气中流通，海洋是其中一个关键的环节。

The oceans are a key part of the natural carbon cycle, in which carbon dioxide is circulated between the land, seas and atmosphere.

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他们在过去的10年间通过循环流通一本叫旅行日志的书保持紧密联系。

They have stayed close for the past 10 years by circulating a book called a traveling journal.

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