This atmosphere has a simple making process, energy saving, and cracking the methanol in a lower temperature while deoxidising of industrial nitrogen.

该气氛制备工艺简单，节省能源，甲醇低温裂解与普氮脱氧同步进行。

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This document mainly deals with the common industrial gases, namely oxygen, nitrogen, hydrogen, argon and acetylene.

这些文件主要涉及到一般的工业气体，通常为氧气，氮气、氢气、氩气和乙炔气。

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The most commonly used industrial gases that are transported, handled, and stored in the liquid state at cryogenic temperatures are argon, helium, hydrogen, nitrogen, and oxygen.

氩、氦、氢、氮和氧是在低温以液体状态运输、操作和储存的最常用的工业气体。

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Most experts warn against ozone, which results from the sun heating hydrocarbons and nitrogen oxides in vehicle and industrial emissions.

CNN: Research finds smog could deal a blow to children's health

In the 1980s nitrogen controls were placed on industrial plant and vehicles, This has led to a cut in emissions of 30%, despite an increase in traffic and economic activity.

BBC: Nitrogen pollution 'costs EU up to ?280bn a year'

The fact that people have used industrial chemistry to short-circuit the nitrogen cycle, by making fertilisers out of nitrogen in the air at a rate which greatly exceeds what natural systems can manage, has real environmental effects.

ECONOMIST: The global environment