常見例句雙語例句Nitrate-nitrogen variation in the biological process for treatment of slightly polluted source water has been investigated by use of a pilot-scale unit and a full-scale plant.通過中試系統和大型工程，探討了微污染水源水生物處理工藝中硝酸鹽氮的變化規(guī)律。 返回 pilot plant unit