carbon cycle

noun

🔊/ˈkɑːbən saɪkl/

🔊/ˈkɑːrbən saɪkl/

[usually singular]

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the processes by which carbon is changed from one form to another within the environment, for example in plants and when wood or oil is burned碳循环（指碳在自然环境中的形式变化过程）