nitrogen-
Nitrogen is of paramount importance to life on earth .
氮对地球上的生命至关重要。
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The faeces contain nitrogen and it is that which fertilises the desert soil .
粪便含氮，而正是氮可以肥化荒芜的土地。
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Air consists chiefly of nitrogen .
空气主要由氮气组成。
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The plant requires nitrogen in order to make proteins .
植物需要氮以便制造蛋白质。
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Combustion at high temperature causes decomposition to nitrogen and water .
氨在高温下燃烧分解成为氮和水。
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The basic nitrogen compounds include pyridines and quinolines .
碱性氮化物包括吡啶和喹啉。
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What is the percentage of nitrogen in air ?
空气中所含的氮的比例是多少？
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Every tonne of coal contains , on average , 30 kilograms of nitrogen .
每吨煤平均含30公斤氮
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Elemental nitrogen is a very unreactive and inert material .
元素氮是一个十分不活跃的惰性物质。
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Cutting speeds by a fifth would reduce CO2 but also limit sulphur and nitrogen oxides , which are damaging to human health .
船只减速五分一不仅会减少二氧化碳的排放，还会限制硫氧化物和氮氧化物的排放，这两种物质对人体健康有害。
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Research Progress on the Water and Nitrogen Detection Using Spectral Reflectance
作物水分和氮素光谱诊断研究进展
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A study of nitrogen & based atmosphere for sintering in foreign countries
国外氮基烧结气氛的研究状况
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Experimental study on nitrogen removing efficiency at low temperature
低温对于脱氮效果影响的试验研究
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Research Advance in the Cycle of Nitrogen between Wheat and Soil
小麦&土壤氮素循环的研究进展
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Gas , temperature T , you take nitrogen .
气体，温度是T，我们有氮气。
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Study on The Efficient Use of Soil Water and Nitrogen for Winter Wheat
冬小麦水氮有效利用的研究
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Simulation of soil nitrogen transport under field conditions ⅱ . verification and application
田间条件下土壤氮素运移的模拟模型Ⅱ田间检验与应用
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Study on composition and property of organic nitrogen in several soils of China
我国几种土壤的有机氮组成和性质的研究
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Effect of Vanadium on Deformation Induced Phase Transformation of High Nitrogen Steel
钒对高氮钢形变诱导相变的影响
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Methods Nitrogen balance test was used .
方法氮平衡试验。
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Liquid nitrogen engine and its performance analysis
液氮发动机及其性能分析
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Use of Neural Network for Dynamic Simulation of Biological Nitrogen and Phosphorus Removal Process
利用神经网络动态模拟生物脱氮除磷过程
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Study on amount of nitrogen fertilizer applied to chestnut in northern China
北方产区栗树氮肥用量研究
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Effect of long-term covering with plastic film on characteristics of nitrogen in soil
长期地膜覆盖对土壤氮素状况的影响
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Response of root morphology to low nitrogen stress in maize seedling
玉米苗期根系对氮胁迫反应的配合力分析
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Analysis of International Urea Market Quotations and Domestic Nitrogen Fertilizer Business Management Situation
国际尿素市场行情与国内企业经营形势分析
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The nitrate content increased with the increasing of nitrogen .
施氮越多，温室韭菜硝酸盐含量越高。
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Nitrogen Loss Accesses in the Soil and Its Effects to Environment Pollution
农田土壤氮素损失与环境污染
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Nitrogen is the most commonly used gas .
氮气是最常用的气体。
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The Experimental Study of Nitrogen Denitrification Kinetics in Soil h
土壤中氮素反硝化作用及其动力学规律的实验研究