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
碳循環（生物之間或生物與環境之間的碳物質交換，主要途逕有生物的光郃作用、呼吸作用、腐爛降解及化石燃料的燃燒） 返回 the carbon cycle