In the late 19th century scientists diagnosed a shortage of nitrogen as a planet-wide problem.

在19世纪晚期，科学家断定，缺氮将成为一个全球性的问题。

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The technique USES hot nitrogen as desorption medium, and recovers the enriched desorption gas in a cooling or absorption manner, thereby realizing zero-release of pollution.

此工艺以热氮气作为解吸介质，富集后的解吸气通过冷凝或吸收方式加以回收，实现污染物零排放。

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The content of exchangeable Al increased with the amount of applied nitrogen as urea.

茶园土壤交换性铝含量随施氮量的提高而增加；

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And as it breaks down, it naturally releases nitrogen into the soil.

VOA: special.2010.06.01

4 6 Just as in nitrogen, we get two, four, six here, but now we have two more electrons.

对于氮，我们有，但是现在我们有两个多的电子。

麻省理工公开课 - 固态化学导论课程节选

We know that ionization energy is going to increase as we go across the periodic table, so that means carbon has a lower ionization energy than nitrogen which is right next to us.

我们知道电离能会随着周期表,向右而逐渐变大，因此碳的电离能比旁边的氮要低一些,那么就像我说的。

麻省理工公开课 - 化学原理课程节选

To capture higher prices, farmers worldwide are planting more corn, which requires seven times as much nitrogen as, say, soybeans, notes AltaCorp Capital analyst John Chu.

FORBES: How To Make Money Off The Drought: Fertilizers And Food

The DEP will introduce hundreds of thousands of oysters as part of an abundant community including mussels, clams and barnacles that will eat their way through this greenery absorbing the surrounding nitrogen as they feed.

FORBES: Oysters Are Back In New York City Waters

Power plants that burn coal produce more than 90 times as much sulfur dioxide, five times as much nitrogen oxide and twice as much carbon dioxide as those that run on natural gas, according to the Government Accountability Office, the regulatory arm of Congress.

MSN: Coal producers find themselves in a hard place