工人们正在使用沉箱进行海底隧道的修建。

The workers are using ___caissons to construct the underwater tunnel.

士兵们将弹药装上弹药运输车准备运输。

The soldiers loaded ammunition onto the ___caissons for transport.

工人们正在使用沉箱为桥梁建造稳固的基座。

The workers are using ___caissons to build a solid foundation for the bridge.