防空洞
7.Every time the air raid siren sounded, people rushed to the nearest air raid bomb shelter.
8.Meanwhile, some anti-air raid caves and tunnels are now open to the public as a natural air-conditioner for people to seek cool shelter from the heat.
9.They had argued about this when the shelter was being built. It was in her m ind to share their refuge.
10.Then suddenly one day when the air raid siren was sounded the professor rushed to the air raid shelter his neighbours from the building.


