blind main pipe

例句：

1. 1. The blind main pipewas the only way to access the basement.
   盲主管道是进入地下室的唯一途径。
2. 2. Theconstruction crew had to work around the blindmain pipe.
   施工队不得不绕过盲主管道工作。
3. 3. The new system replaced the old one, eliminating the blind main pipe and makingit easier to maintain.
   新系统取代了旧系统，消除了盲主管道，使维护更加容易。