underwatertunnel

例句：

1. 1. The underwater tunnel connects the two cities, allowing for seamless transportation between them.
   水下隧道连接了两个城市，使得两地之间的交通无缝对接。
2. 2.The construction of this underwater tunnel has been a major project for years.
   这个水下隧道的建设是多年来的一个主要项目。
3. 3. The underwater tunnel is a marvel of engineering, providing safe access to remote areas.
   这个水下隧道是一个工程奇迹，为偏远地区提供了安全的通行方式。