for example, by oxidation of ammonia to nitrite or a mitrite to nitrate (by nitrifying bacteria), or oxidation of hydrogen sulfide to sulfur(by colorless sulfur bacteria).
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- 例如把氨氧化为亚硝酸盐或硝酸盐(通过硝化细菌),或把硫化氢氧化为硫(通过无色的硫细菌)。