Always use an external source of nitrogen or air for this purpose.
做类似事情时，只能用氮气或空气作为外在气源。
Manure has become a minor source of nitrogen in all major agricultural countries.
在主要的农业国家动物粪便已经不是氮肥的主要来源。
The effect of nitrogen source on the sporulation was complex.
氮源对孢子产生的影响较为复杂。
The influence of ventilatory capacity and nitrogen source on fermentation process were also studied.
并研究了通气量、氮源对发酵的影响。
The influence of ventilatory capacity and nitrogen source on fermentation process were also studied.
并研究了通气量、氮源对发酵的影响。
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