碳的循环在学校教科书中已经讲过了。

The carbon cycle is the stuff of school books.

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湿地土壤碳的循环对全球大气碳的收支平衡以及全球气候变化可能产生重大影响。

Soil carbon cycling in wetlands largely affected global carbon cycling and also possibly global climatic changes.

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但是，生物质农作物的碳平衡必需依赖整个生命循环。

But the carbon balance for biomass crops depends on the whole lifecycle.

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It's phosphate, carbon, carbon, carbon, phosphate, carbon, carbon, carbon, phosphate and it has this structure hanging off the side.

就是磷酸基与戊糖的碳反复连接,如此循环往复,这种结构构成了主链的一边

耶鲁公开课 - 生物医学工程探索课程节选