circular furnace

例句：

1. 1. The circular furnace is used for heating and cooking.
   圆筒炉用于加热和烹饪。
2. 2.The engineer designed a new circular furnace to improve efficiency.
   工程师设计了一种新型的圆筒炉以提高效率。
3. 3. The circular furnace was the only source of heat in the old factory.
   圆形炉是旧工厂唯一的热源。