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In a process called denitrification, the microbes convert nitrates in the water into nitrogen gas, which is released into the atmosphere. 在這種名為脫氮作用的過程中，微生物將在水中的硝酸鹽肥料轉(zhuǎn)化為氮?dú)猓⑨尫胚M(jìn)入大氣環(huán)境。