thick, soft, wet mud or a substance that looks like it 烂泥；淤泥；烂泥状沉积物 industrial or human waste that has been treated 工业淤泥；工业污泥；生活污物 industrial sludge 工业淤泥 the use of sewage sludge as a fertilizer on farm land 把下水道污泥用作农田肥料的做法
Word Originearly 17th cent.: of uncertain origin; compare with slush.