straight line furnace

例句：

1. 1.The straight line furnace is used for heatingand drying materials.
   直线炉用于加热和干燥材料。
2. 2. The straight line furnace is anessential tool in the manufacturing process.
   直线炉是生产过程中不可或缺的工具。
3. 3. The straight line furnacehas a high efficiency and low energy consumption.
   直线炉效率高、能耗低。