Aim To study the decolorization effect of printing and dyeing wastewater with spongy iron and manganese sand as the porous metal filter material.是什么意思_Aim To study the decolorization effect of printing and dyeing wastewater with spongy iron and manganese sand as the porous metal filter material.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句