double-current furnace

例句：

1. 1. The double-current furnace is used for heating and melting metals.
   双电流炉用于加热和熔化金属。
2. 2. In the manufacturing process, the double-current furnace plays a crucial role in refining materials.
   在制造过程中，双电流炉在提炼材料中起着至关重要的作用。
3. 3. The double-current furnace is an essential tool in the metallurgical industry.
   双电流炉是冶金工业中不可或缺的工具。