The problem of color removal from the pulp-paper mill wastewater, a main kind of industrial effluents, was a matter of great concern and a subject of research during the last few decades.是什么意思_The problem of color removal from the pulp-paper mill wastewater, a main kind of industrial effluents, was a matter of great concern and a subject of research during the last few decades.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句