cement bunker

例句：

1. 1. The engineer designed a concrete bunker to protect the workers during an earthquake.
   工程师设计了一个混凝土掩体来保护工人在地震期间的安全。
2. 2. The soldiers huddled together in the concrete bunker to wait for rescue.
   士兵们挤在一起躲在混凝土掩体里等待救援。
3. 3. The construction crew used concrete to build a sturdy bunker for their safety.
   建筑队使用混凝土建造了一个坚固的掩体，以确保他们的安全。