氮氧化物的浓度 meaning in Chinese
concentration of nitrogen oxides
Examples
- Compared with the figures of 1999 , the concentrations of respirable suspended particulates and nitrogen oxides at the street level in urban areas were eight per cent and 11 per cent lower respectively in 2001
与一九九九年相比，去年从市区路边空气中所录得的粒子和氮氧化物的浓度，分别降低了百分之八和百分之十一。