Read Edit View history 氮氧化物 dànyǎnghuàwù nitrogen oxide Origin Definitions Defs Strokes Stroke Words Sentences Sents Senses Add sense 氮氧化物 dànyǎnghuàwù nitrogen oxide noun 减少汽车排放的氮氧化物是改善空气质量的关键。 Edit Delete References Add reference No references for this word.