/nɑ?ks/thegasesnitricoxideandnitrogendioxide, that areproducedwhenfuelisburnedand that areharmfulto theenvironment:(作为空气污染物的)氮氧化物newengineswhichproducelowerNOxemissions氮氧化物排放量较低的新型发动机SMART Vocabulary: related words and phrasesChemistry: types of chemical
acid salt
aerogel
alkali metal
alkaline
alkalinity
carbohydrate
dioxide
dioxin
inorganic
lectin
melamine
methyl orange
monomer
nitrogenous
pectin
propellant
reactant
saline
soluble
sulphide
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