canal tunnel

例句：

1. 1.The canal tunnel connects two cities in the region.
   这条运河隧道将该地区的两个城市连接起来。
2. 2.The tunnel is so narrow that only one person can pass through at a time.
   这个隧道非常狭窄，只能一个人同时通过。
3. 3. The construction of the canal tunnel has been completed successfully.
   运河隧道的建设已经成功完成。