the ammonia nitrogen density
...氨氮浓度;水环境容量; [gap=1129]eyword： Fluid matter of Yangtze River; sour salt index number of high manganese; the ammonia nitrogen density; environment capacity of water ..
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the ammonia nitrogen density
氨氮密度
以上为机器翻译结果，长、整句建议使用 人工翻译 。