工人们的工作是去掉银金属里的杂质。
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.
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.
我们得把杂质去掉。
所得少量浓缩液去掉铁等杂质之后，加过量氨使钴形成络合物，再用锌粉置换出金属钴粉。
Cobalt can be converted into complex ion by excess ammonia and then recovered as highly pure metal cobalt powder by replacing with zinc powder.
所得少量浓缩液去掉铁等杂质之后，加过量氨使钴形成络合物，再用锌粉置换出金属钴粉。
Cobalt can be converted into complex ion by excess ammonia and then recovered as highly pure metal cobalt powder by replacing with zinc powder.
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