There, in a process called denitrification, microbes convert the nitrogen into nitrous oxide (also called laughing gas) and an inert gas called dinitrogen.

在那里，经称为脱氮的过程，微生物把氮转化为一氧化二氮(又称笑气)和一种称为二氮的惰性气体。

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The present invention is spraying pyrolysis process of preparing nitrogen doped hole type zinc oxide film material, and belongs to the field of semiconductor material.

本发明涉及掺氮空穴型氧化锌薄膜材料的喷雾热解制备方法，属于半导体材料领域。

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The process that smokestack "scrubbers" use to reduce nitrogen oxide and sulfur dioxide emissions creates high-quality synthetic gypsum, said Robert E.

CNN: Turning toxic coal ash into bridges, buildings