n.氮
Air consists chiefly of nitrogen. 空气主要由氮气组成。
Nitrogen is a gas without colour or smell. 氮是一种无色无臭的气体。
Nitrogen forms most of the Earth's air. 地球上空气的大部分成分是氮气。
If it were not for oxygen and nitrogen in the air, no man could live on the earth. 大气中如果没有氧和氮，人就无法生存于地球了。
adj.氮的；含氮的
加氢脱氮
n.脱氮(去氮法)
