... parts w per million 百万分之一 equivalent parts per million毫克当量 defective parts per million 杰尔还是每百万缺陷数 ; 每百万缺陷数 ...
权威例句
1.
Through afforestation, reforestation and cutting down agricultural emissions, by one estimate, carbon dioxide equivalent to 40 partspermillion could be extracted from the atmosphere by 2050.
ECONOMIST: A special report on forests
2.
Atmospheric concentrations of CO2 equivalent (carbon dioxide and other greenhouse gases) reached 430 partspermillion last year, compared with 280ppm before the industrial revolution.