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In general,stock raising,aquaculture and non-point source are the reasons for ammonia nitrogen pollution in inner-rivers whereas the sewage which isn't treated is the key pollutant source. 研究结果表明,畜牧水产业和非点源都是比较显著的氨氮污染源,但未经集中式污水处理厂处理的生活污水,则成为内河涌最重要的氨氮污染源。
Ammoniac nitrogen pollution is to bring about Jiang He laky water system one of main factors of eutrophication. 氨氮污染是导致江河湖泊水体富营养化的主要因素之一。
Road transport produces most of both types of gunk: 83% of the fine particles and 46% of the nitrogen pollution. 这两种黏性物质主要由公路交通产生：83%25的细颗粒物以及46%25的氮氧化物污染。
Nitrogen pollution in water body can not only cause eutrophication but also has direct hazardous effects on animals and human beings. 水体的氮污染不仅可以引起水体富营养化,还可直接影响动物及人体的健康。
Mulholland and his collaborators found that the filtering ability of streams couldn't keep pace with the flow of nitrogen pollution. 穆昊兰德和他的伙伴们发现，支流的过滤能力无法应对氮污染的侵蚀。
After analyzing the characteristics of ammonia nitrogen pollution in Huaiyin section of Salt river,the sources of ammonia nitrogen are investigated. 在分析盐河淮阴段氨氮污染的特征后,对氨氮的来源进行了研究。
After analyzing the characteristics of ammonia nitrogen pollution in Huaiyin section of Salt river, the sources of ammonia nitrogen are investigated. 摘要在分析盐河淮阴段氨氮污染的特征后，对氨氮的来源进行了研究。
Nitrogen isotopic technique was used to study the situation and seasonal change of nitrogen pollution in inflowing rivers and an outflowing river of Hongfeng Lake in this paper. 利用氮同位素技术对贵州红枫湖各输入、输出河流氮污染状况和季节性变化规律进行了研究,并通过对输入河流和输出河流的氮对比,探讨红枫湖的氮负荷变化。
As an effective tracing method, stable nitrogen isotope is significant for studying the nitrogen cycling, especially for identifying source of nitrogen pollution. 稳定氮同位素作为一种有效的示踪手段，在研究氮循环特别是污染氮源的识别方面有重要意义。
Air consists chiefly of nitrogen. 空气主要由氮气组成。
Deep oxidation of volatile organic nitrogen pollutants such as N-dimethylformsmide (DMF) and butylamine could be achieved under the catalysis of PCN-1 and PCN-2. The activtiy of the two catalysts were studied. 介绍了两种催化剂PCN-1,PCN-2型对含氮有机物如N,N-二甲基甲酰胺(DMF)、正丁胺、环己胺、苯胺、硝基苯等深度氧化的活性及控NO_x能力。
The results showed that anthropogenic activities had intense effects on the nitrogen pollution, and various agricultural and anthropogenic activities had different nitrogen pollution characters. 受农田径流影响的河流，水体受铵态氮污染的风险较小，受硝态氮的污染较重；
Nitrogen forms most of the Earth's air. 地球上空气的大部分成分是氮气。
Discharge pipe take pollutant away from the coastal area into the sea. 排泄管道将污染性物质由沿海岸区排入大海。
The lamp is full of gaseous nitrogen. 灯里充满了气体氮。
Nitrogen forms about 78% of the earth's atmosphere. 氮约占地球大气的百分之七十八。
agriculture NPS nitrogen pollution 农业非点源氮污染
Carbon dioxide may not be a typical air pollutant. 二氧化碳可能不是一种典型的污染物。
non-point source nitrogen pollution 非点源氮污染
Coal itself is a heavy pollutant. 煤本身就是一种严重的污染物。