cast iron lining

例句：

1. 1.The furnace is lined with cast iron to prevent heat loss.
   炉子被铸铁衬里，以防止热量损失。
2. 2. The pipe was lined with cast iron to make it more durable.
   管道被铸铁衬里，使其更耐用。
3. 3.The roof of the house is lined with cast iron to keep out the cold.
   房子的屋顶被铸铁衬里，以抵御寒冷。