indoor pipe trench

例句：

1. 1. The underground pipeline runs through the city center.
   这条地下管道穿过市中心。
2. 2. The construction crew was working diligently to complete the indoor piping trench.
   施工队正努力完成室内管道沟渠的施工。
3. 3. The engineers were inspecting the indoor pipeline for any leaks.
   工程师们在检查室内管道是否有泄漏。