n.氮
Air consists chiefly of nitrogen. 空氣主要由氮氣組成。
Nitrogen is a gas without colour or smell. 氮是一種無色無臭的氣體。
Nitrogen forms most of the Earth's air. 地球上空氣的大部分成分是氮氣。
If it were not for oxygen and nitrogen in the air, no man could live on the earth. 大氣中如果沒有氧和氮，人就無法生存于地球了。
adj.氮的；含氮的
加氫脫氮
n.脫氮(去氮法)
