Biogas generated from the sludge digestion in wastewater treatment plants is a potential clean energy source, which can be recycled in several ways.是什么意思_Biogas generated from the sludge digestion in wastewater treatment plants is a potential clean energy source, which can be recycled in several ways.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句