These microbes enable the soil to have more nitrogen, which plants need to live and they remain quite active during the winter.

这些微生物可以让土壤中植物生长所需的氮含量增加，在冬天让植物仍保持活跃。

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The catalyst active stability can be more fully recovered by regeneration carried out in three steps in succession, namely, benzene extraction, nitrogen blowing and coke burning.

按苯抽提、氮气吹扫、烧焦的顺序，分三个阶段进行催化剂再生，再生催化剂的活性稳定性得到更充分的恢复。

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The number of active hydrogen atoms attached to nitrogen atom of different classes of amine determine their effectiveness in extraction of metals by solvation.

根据与氮相连结的活性氢原子的多寡与有无，讨论了伯、仲、叔胺类溶剂化能力的强弱。

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Conventional farming methods using conventional fertilisers are adding active nitrogen to the soil, which tends to move to other places - lakes, rivers, seas, the air.

BBC: Food: Organic growth?