单词：nitrogen oxides
nitrogen oxides的用法和样例：
例句
- In the spark-ignition engine, recirculating some of the exhaust gas reduces the emission of nitrogen oxides.在火花点火的发动机中，再循环的一部分废气减少了氧化氮的有害污染物。
- The concentrations of nitrogen dioxide and ozone also exceed the objectives for a few days in a year.二氧化氮及臭氧的浓度，每年也有几天超出了空气质素指标。
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