短語詞組短語nitrogen n cycle 氮循環(huán)nitrogen -phosphorus cycle 氮磷循環(huán)carbon n nitrogen cycle 碳nitrogen cycle bacteria 氮循環(huán)茵;氮循環(huán)菌soil nitrogen cycle 氮素循環(huán)Nitrogen cycle refrigeration 氮循環(huán)制冷the nitrogen cycle 氮循環(huán);氮素循環(huán);循環(huán)carbon nitrogen cycle 碳循環(huán);碳 返回 nitrogen cycle