underground shelter的用法和样例：
例句
- The building was constructed over ancient Yellow River and its dike, and an air raid shelter underneath.
该建筑物的基础横跨黄河故道及堤岸，并贯穿有地下防空洞。 - This article presented the basic principle about inspecting undergroud air-raid shelter with the method of transient rayleigh waves and offered a new method.
本文介绍了瞬态瑞雷波法探测地下防空洞的基本原理，提出了一种改进的方法。
