furnace liner

例句：

1. 1. The steelworker carefully fitted the furnace liner to the furnace before starting the operation.
   这位钢铁工人在开始操作之前，仔细地将炉衬安装到炉子上。
2. 2. The furnace liner is designed to prevent hot gases from escaping during the heating process.
   炉衬的设计是为了在加热过程中防止热气体逃逸。
3. 3. The furnace liner was replaced after several years of use due to wear and tear.
   由于磨损，炉衬在使用几年后被更换了。