It is common that composite impervious layers of GM+GCL,which are superior to only GM or CCL,are used in solid waste landfills.是什么意思_It is common that composite impervious layers of GM+GCL,which are superior to only GM or CCL,are used in solid waste landfills.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句