drainage pipe line

• 排水管道(线)

drainage pipe line的用法和样例：

例句

1. The drainage system is being improved with additional drainage channels dug to ensure the pitch remains in top condition.
   我们挖掘了额外的排水管道以便使排水系统保持最佳状态。
2. To prevent water damage, the valve must be properly connected to a discharge line which terminates at an adequate drain.
   为了防止水的破坏，这些阀门必须与排水管道连接，以便能够将水排到适当的排水口。