drainage pipe line的用法和樣例：
例句
- The drainage system is being improved with additional drainage channels dug to ensure the pitch remains in top condition.
我們挖掘了額外的排水管道以便使排水系統保持最佳狀態(tài)。 - To prevent water damage, the valve must be properly connected to a discharge line which terminates at an adequate drain.
為了防止水的破壞，這些閥門(mén)必須與排水管道連接，以便能夠將水排到適當的排水口。
