ring furnace

例句：

1. 1. The ring furnace is used to heat metals and alloys.
   环形炉用于加热金属和合金。
2. 2. The ring furnace is essential for the production of high-quality steel.
   环形炉对于生产高质量钢材至关重要。
3. 3. The ring furnace is a versatile tool that can be used for various metal processing tasks.
   环形炉是一种多功能工具，可用于各种金属加工任务。