copper smelter

例句：

1. 1. The copper smelter in the city produces a significant amount of copper ore.
   这个城市的炼铜厂生产大量的铜矿石。
2. 2.The smelter is a complex machine that converts raw materials into metal products.
   炼铜厂是一个复杂的机器，将原材料转化为金属产品。
3. 3. The smelter's emissions are a major concern for environmentalists.
   炼铜厂的排放是环保人士的主要关切。