The cities in the Double-Control Zones where the annual concentration of SO2 attained Grade II standards account for 48.4% and 79.7%.是什么意思_The cities in the Double-Control Zones where the annual concentration of SO2 attained Grade II standards account for 48.4% and 79.7%.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句