化合态氮的抑制作用与浓度密切相关。
This inhibiting effect was due chiefly to the concentration of combined nitrogen.
氮是生物生存所必需的重要元素，生物中的动植物只能利用化合态氮而不能利用分子态氮。
Nitrogen, the crucial element for the survival of the biology, only can be utilized by the propagation in the compound form instead of molecular form.
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