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.
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.
法国研究小组发现，同一样的多酚化合物在相对较低的剂量时，对心脏病和心血管循环系统的流通有显著的作用。
At relatively low doses, the French researchers found that the same polyphenols play a beneficial role for those with diseased hearts and circulatory systems by facilitating blood vessel growth.
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