Of three nitrogen fertilizer types, the amide-form nitrogen source was better to the formation and accumulation of gliadin as well as its four fractions.

比较而言，酰胺态氮素更有利于醇溶蛋白及各组分的形成与积累。

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The three most important nutrient recycles are the nitrogen cycle, the carbon cycle and the one we are going to talk about today, the Phosphorus cycle.

这三种最重要的营养循环包括氮循环、碳循环和我们今天要讲的磷循环。

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Scientists at the agroforestry center say the use of fertilizer trees can reduce the need for chemical nitrogen by up to three-fourths.

VOA: special.2009.09.01

If we take nitrogen, we've got N2, and we've got one, two, three, four, five.

比如说氮，我们得到了氮气，我们有一个，两个，三个，四个，五个。

麻省理工公开课 - 固态化学导论课程节选

Here is the second nitrogen, one, two, three, four, five.

这是第二个氮，一二三四五。

麻省理工公开课 - 固态化学导论课程节选

Three-quarters of the company's sales are of nitrogen fertilizers, and it has a big position in domestic production, with two of the three largest nitrogen fertilizer plants in North America.

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The chemical, one part nitrogen to three parts hydrogen, stores a lot of energy: a gallon of it has about half the Btus as a gallon of diesel.

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Engineers said they were considering also injecting nitrogen into the number two and three reactors.

BBC: Japan quake: Nitrogen pumped into nuclear reactor