the carbon cycle

剑桥词典

the continuous movement of carbon between different living organisms on earth and between living organisms and the environment , through natural processes like photosynthesis , respiration , and decomposition in the soil , and also the burning of fossil fuels
碳循环（生物之间或生物与环境之间的碳物质交换，主要途径有生物的光合作用、呼吸作用、腐烂降解及化石燃料的燃烧） 返回 the carbon cycle