The time weighted average concentration(TWA) of benzene in workplace (42 29 mg/m 3) was higher than that of our national maximum allowable concentration (6 mg/m 3).是什么意思_The time weighted average concentration(TWA) of benzene in workplace (42 29 mg/m 3) was higher than that of our national maximum allowable concentration (6 mg/m 3).在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句