熔炉

例句：

1. 1. The iron ore is heated in a furnace to extract the metal.
   铁矿石在熔炉中加热以提取金属。
2. 2. The blacksmith uses a crucible to melt down the metals.
   铁匠使用坩埚熔化金属。
3. 3. The forge is the heart of the blacksmith's workshop.
   锻炉是铁匠工作室的核心。