It is because of its chemicalpurity that tragedy so effectively performs functions of catharsis.
——正是由于悲剧的这种化学纯度，它才非常有效地完成着它那净化感情的作用。
2
Chemicalpurity is not required for food use because cellulosic cell-wall materials are components of all fruits and vegetables and many of their products.
食品应用中不需要化学净化，因为纤维素细胞壁材料是所有果蔬和其它产品的成分。
3
Thecontents of metal impurities in the bismuth products obtain the standards of the analysis reagent and the contents of anions obtain the standard of the grade of chemicalpurity.