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carbon cycle
agric.	碳［素］循环 (carbocirculus)
clim.	碳循环
tech.	碳素循环
carbon cycle The cycle of carbon in the biosphere, in which plants convert carbon dioxide to organic compounds that are consumed by plants and animals, and the carbon is returned to the biosphere in inorganic form by processes of respiration and decay
environ.	碳循环 (生物圈中的碳循环，在这个循环中，植物将二氧化碳转化成供植物和动物消费的有机化合物，碳元素通过呼吸和衰亡过程以无机物的形式返回到生物圈中。)

carbon cycle: 19 phrases in 14 subjects

Agriculture	2
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