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 best carbon source is maltose. The best nitrogen source is asparagine.
最佳碳源为麦芽糖，最佳氮源为天门冬素；
Lactose is also identified as the best carbon source while asparagine the best nitrogen source.
同时确定了乳糖为最佳碳源，天门冬素为最佳氮源。
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。
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。
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。
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