main line guide pipe

例句：

1. 1. Themain line guide pipe is essential for thesafe operation of the pipeline system.
   主干线导引管对于管道系统的安全运行至关重要。
2. 2. Main line guide pipes are used todistribute water and gas throughout the building.
   主干线导引管用于将水和气体在整个建筑中分配。
3. 3. The installation ofmain line guide pipes requires specialized training andexpertise.
   安装主干线导引管需要专门的培训和专业知识。