fire-proof door

例句：

1. 1. The fire-proof door is designed to prevent fire from spreading.
   防火门的设计是为了阻止火势蔓延。
2. 2.The new building has a fire-proof door installed in every room.
   新建筑的每个房间都安装了防火门。
3. 3.The fire-proof door is the first line of defense against fire.
   防火门是防止火灾的第一道防线。