甬道

例句：

1. 1. The tunnel is narrow and winding, making it difficult to navigate.
   这条隧道狭窄曲折，难以通行。
2. 2. The tunnel was used as a passage for the underground trains.
   这条隧道被用作地下列车的通道。
3. 3. The tunnel was discovered during an archaeological excavation.
   这条隧道是在一次考古挖掘中被发现的。