amount of foulingcontamination degreecontamination leveldegree of contaminationdegree of pollutionpolluting strengthpollution level污染: pollute; contaminate程度: level; degree排气污染程度: emission level污染程度不同…: pollution… differ in degree污染程度测定器: contamination tester下载手机词典可随时随地查词查翻译