Even nitrogen, which is a gas in its elemental state, is normally absorbed from the soil as nitrate ions.

即使是元素状态为气体的氮，也通常作为硝酸根离子从土壤中被吸收。

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Then anaerobic bacteria take that nitrate and turn it into harmless nitrogen gas.

最后厌氧菌将硝酸盐转化成无害的气体氮。

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Take some nitrogen gas.

拿一点氮气。

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