Economical and effective control of pollution by ammonia-nitrogen waste water is a vital problem currently.
经济有效地控制氨氮废水污染是当前面临的重大课题。
Ammonia is the feed stock to make nitrogen-based fertilizers.
氨是氮基，化肥的原料。
There was little growth apparent when ammonia as a sole nitrogen source.
当氨作为唯一的氨源时，它对细菌的生长无刺激性。
There was little growth apparent when ammonia as a sole nitrogen source.
当氨作为唯一的氨源时，它对细菌的生长无刺激性。
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