防空洞

例句：

1. 1. The city has several underground shelters for emergency situations.
   这个城市有几个地下避难所用于紧急情况。
2. 2. During the war, many people hid in these underground shelters to avoid bombing.
   在战争期间，许多人躲藏在这些地下避难所以避免轰炸。
3. 3. The soldiers used the tunnels as a means of escape during the battle.
   士兵们利用隧道作为战斗中的逃生手段。