hermetic seal furnace

例句：

1. 1.The hermetic seal furnace is used for melting metals.
   密封式炉用于熔化金属。
2. 2.This hermetic seal furnace is highly efficient in energy use.
   这种密封式炉在能源使用上非常高效。
3. 3.The hermetic seal furnace has been widely used in the manufacturing industry.
   密封式炉在制造业中被广泛使用。