double-muffle furnace

例句：

1. 1.The double-muffle furnace is used for heating and drying materials.
   双层炉用于加热和干燥材料。
2. 2.The double-muffle furnace is a popular choice for industrial applications.
   双层炉是工业应用中受欢迎的选择。
3. 3. The double-muffle furnace is designed to provide even heat distribution.
   双层炉设计用于提供均匀的热量分布。