firedoor hinge

例句：

1. 1. The new security system requires a fire door hinge to be installed in every room.
   新的安全系统要求在每个房间都安装一个防火门铰链。
2. 2. The engineers replaced the old fire door hinge with a more durable one.
   工程师们用更耐用的防火门铰链替换了旧的。
3. 3. The fire department advised that all homes should have a fire door hinge installed.
   消防部门建议所有家庭都应该安装防火门铰链。