VERB
熔炼;冶炼
To smelt a substance containing metal means to process it by heating it until it melts, so that the metal is extracted and changed chemically.
例句
Darby was looking for a way to improve iron when he hit upon the idea of smelting it with coke instead of charcoal.
达比一直在寻找改善铁质的方法，他猛然想到可以不用木炭熔炼，而改用焦炭。