furnace useful tank

例句：

1. 1. The furnace was used to melt the metal into a smooth shape.
   这个熔炉用来把金属熔化成光滑的形状。
2. 2. The forge is where iron is heated and shaped into tools.
   锻造炉是加热和塑造铁器的地方。
3. 3. The hearth of the fireplace is where people sit around enjoying a warm fire.
   壁炉的火坑是人们围坐在温暖的火堆周围享受温暖的地方。