cut-type tunnel without cover

例句：

1. 1.The engineer designed a cut-type tunnel to bypass the mountain.
   工程师设计了一个无盖隧道来绕过山。
2. 2.The construction of the cut-type tunnel has been completed.
   无盖隧道的施工已经完成。
3. 3. The cut-type tunnel is an essential part of the road infrastructure.
   无盖隧道是道路基础设施的重要组成部分。