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1. Oxford Dictionary

   nitrogen cycle

   英式

   • n.
     the series of processes by which nitrogen and its compounds are interconverted in the environment and in living organisms, including nitrogen fixation and decomposition.

   • noun: nitrogen cycle, plural noun: nitrogen cycles

2. • 更多解釋

   nitrogen cycle

   • IPA[ˈnītrəjən ˈsīkəl]

   美式

   • n.
     the series of processes by which nitrogen and its compounds are interconverted in the ...

   Oxford American Dictionary