氨是氮基，化肥的原料。

Ammonia is the feed stock to make nitrogen-based fertilizers.

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由于对培养基中高水平的还原氮的反应而发生的。

This may occur in response to a high level of reduced nitrogen in the medium.

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由于对培养基中高水平的还原氮的反应而发生的。

This may occur in response to a high level of reduced nitrogen in the medium.

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