main pipe line

• 周道,总管系,主管道

main pipe line的用法和样例：

例句

1. The plumber finds no pipe leaks and suspects a mains leak.
   水管工没有发现漏水的水管，怀疑是主管道漏水。
2. Bypasses are used in steam service for warming up before the main line is opened and for balancing pressure where the lines are of limited volume.
   旁路阀用在蒸汽操作中，用于在主管道开启前对其进行预热以及管道数量有限时平衡压力。