Scientists say the excess heavy nitrogen could have come from a comet.
科学家认为过量的重氮来自彗星。
Scientists say the excess heavy nitrogen could have come from a comet. And the heavier oxygen from a natural process that left more of the light isotope in the part of the nebula that made the sun.
科学家认为重氮来自一颗彗星，而重氧则是来自行星形成的自然过程，这一过程把更轻的氧同位素留在了星云中，形成了太阳。
In areas with heavy automobile traffic, however, the seed germinates in the absence of fire, with automobile exhaust supplying the required nitrogen dioxide.
然而，在汽车交通繁忙的地区，种子在没有火灾的情况下借助汽车尾气提供所需的二氧化氮发芽。
Heavy rains flooded the land. A lack of nitrogen in the soil made the corn stalks puny.
有些农田被牲口过度放牧亏损，暴雨淹没了田地，缺乏氮气造成玉米的秆子矮小。
Considering the high contents of olefins and nitrogen, the whole fraction of delayed coker distillates (including light and heavy naphtha, gas oil) must be hydrotreated.
延迟焦化馏出油(包括汽油、柴油及蜡油)的烯烃含量和氮含量高，必须进行加氢精制。
In heavy oil, not only the absolute concentrations but also the ratio indicators of neutral nitrogen compounds are too low to distinguish the oil migration path.
重质油中，无论是中性含氮化合物的绝对浓度或是其比值指标都降低，严重影响了原油运移途径的判别。
The new-developed slurry bed hydrocracking technology for processing heavy oil with high contents of metal, nitrogen, gum and residual carbon has been developed in China.
针对劣质重油中金属、氮、胶质、康氏残炭含量高的问题，国内已经开发了悬浮床加氢裂化工艺。
Algae can be used in wastewater treatment to remove nutrients (inorganic nitrogen and phosphorus) and heavy metal pollutants.
藻类可用于污水处理去除污水中的氮磷营养及重金属离子等污染物。
So the oil sand's oil is heavy crude oil with high nitrogen, high wax, high gel and low sulfur.
该油砂油是一种高含氮、高含蜡、高含胶、低含硫的重质原油。
Therefore, selection of the forms of nitrogen applied may be considered as an effective measure of controlling uptake of heavy metals by crops.
因此，氮肥形态的选择供应可作为控制作物对重金属吸收的一种措施。
Nitrogen foam thermal flooding is a new method for enhanced oil recovery of heavy oil.
氮气泡沫热力驱是一种新的提高稠油油田采收率的方法。
To problems of testing in heavy oil Wells, the improvement and completion of testing technology have been conducted by hydraulic nitrogen to control pressure difference.
针对稠油井测试工艺存在的问题，对稠油井测试工艺进行了改进和完善，认为用液氮可以控制压差。
The detection results showed: the pH is normal, heavy metals, p, the total inorganic nitrogen and DO accord with class I water quality standard, COD belongs to the class III water quality standard.
水质检测结果显示酸度正常，重金属、P、总无机氮、溶解氧符合一类水质标准，COD属于三类水质标准。
The contents of organic matters, heavy metals, nitrogen, phosphorus, sulfide, et al. in Marine areas are becoming higher, which enhance the pollution of sediment environment.
海洋中有机质、重金属、氮、磷、硫化物等含量的增加加重了沉积环境的污染。
The application of nitrogen spring on cool punching die is introduced, and the elastic components such as 'heavy-load used polyurethane' components is briefly stated.
前言：介绍氮气弹簧在冷冲模中的应用，另外还简单介绍了“高负载用聚氨酯”组件等弹性元件。
Nitrogen has a heavy impact on the properties of the single crystal silicon, and its properties, forms and mechanisms on reactions with related defects have been intensively investigated.
氮杂质对硅单晶的性质有重要的影响，氮在硅中的性质、存在形态以及和相关缺陷作用机理一直为人们所研究。
An overview of internal and external study is made on high temperature purification of gaseous contaminants including sulfur, nitrogen and chlorine pollutants, alkali metal, heavy metal and tar vapor.
综述了国内外硫、氮、氯的污染物和碱金属、重金属、焦油蒸气等气体污染物的高温净化研究概况，提出了存在的技术问题。
Zeolite is a natural and cheap mineral, which could be used in the removal of ammonia nitrogen, organic compound, turbidity, heavy metal and oxyanion from water.
沸石是一种天然廉价矿物，可用于去除水中氨氮、有机物、浊度、重金属离子和含氧酸阴离子。
The character of granule, cultivation of special granule and its application to COD removal, de-nitrogen, toxic chemicals degradation, heavy metal adsorption in wastewater treatment were reviewed.
并详细介绍了颗粒污泥的特点，特种颗粒污泥的培养及其在COD去除、脱氮、降解毒性物质和重金属吸附等方面的应用，并对其应用前景进行了展望。
In consideration of the characters of heavy oil reservoirs in Block Mian 120, the mechanism of nitrogen-assisted steam stimulation is studied.
针对面120块稠油油藏特点，开展了氮气辅助蒸汽增产机理研究。
In consideration of the characters of heavy oil reservoirs in Block Mian 120, the mechanism of nitrogen-assisted steam stimulation is studied.
针对面120块稠油油藏特点，开展了氮气辅助蒸汽增产机理研究。
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