working furnace

例句：

1. 1. The working furnace is the heart of our manufacturing process.
   工作炉是我们制造过程的核心。
2. 2. The forge was used to shape the metal before it was sent to the working furnace.
   在送往工作炉之前，锻铁被用来塑造金属。
3. 3. The skilled blacksmiths worked tirelessly in their working furnaces.
   熟练的铁匠们在他们的工作炉中辛勤劳作。