As we all know,in the sewage there contains a great deal of poisonous gas ,such as CO,CO2,methane and sulfureted hydrogen etc.是什么意思_As we all know,in the sewage there contains a great deal of poisonous gas ,such as CO,CO2,methane and sulfureted hydrogen etc.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句