The pollution sources of NGD in Chengdu are analyzed by the chemical mass balance method based on receptor model.The average contribution rate of five pollution sou...是什么意思_The pollution sources of NGD in Chengdu are analyzed by the chemical mass balance method based on receptor model.The average contribution rate of five pollution sou...在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句