filtering stock

用法例句

The important link of the pulp and paper making production——raw pulp washing plays and important part in raising the alkali-recovery of black-liquid residue and reducing the drain pollation.

粗浆洗涤是制浆造纸生产中的重要环节,对于提高黑液碱回收率,减少排水污染,起着关键的作用。