non-metallic impurity

例句：

1. 1. The steel was found to contain asignificant amount of non-metallicimpurities.
   该钢材被发现含有大量的非金属杂质。
2. 2. The chemical process involved removingnon-metallic impuritiesfrom the raw material.
   该化学过程涉及从原料中去除非金属杂质。
3. 3. Theengineers were tasked with cleaning upthe non-metallic impurities in the factory.
   工程师们被指派清理工厂中的非金属杂质。