This regulation prescribes the concentrations of benzene, toluene and dimethylbenzene in air forresidential area by gas chromatograph method.是什么意思_This regulation prescribes the concentrations of benzene, toluene and dimethylbenzene in air forresidential area by gas chromatograph method.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句