duplex tube

例句：

1. 1. The duplex tube is designed to provide a smooth flow of water through the pipes.
   双联管的设计是为了通过管道提供水流的平滑流动。
2. 2. The construction company used duplex tubes to reinforce the foundation of the building.
   建筑公司使用双联管来加固建筑物的基础。
3. 3. The duplex tube system was installed in the new hospital, providing efficient and reliable medical services.
   在新的医院安装了双联管系统，提供了高效可靠的医疗服务。