工人们的工作是去掉银金属里的杂质。

The workers' job was to remove impurities from the silver.

youdao

采下茶叶后，将其蒸青、干燥，然后深加工，去掉叶脉、梗和杂质。

When the leaves are harvested they are steamed, dried and then further processed to remove the veins, stems and impurities.

youdao

据说煤中掺有石子和其它杂质须去掉时，至今仍得把煤在矿上筛过。

To this day coal is said to be screened in the colliery when it has stone and other impurities removed from it.

youdao