drain-pipe的用法和樣例：
例句
- 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，這些閥門必須與排水管道連接，以便能夠將水排到適當的排水口。 - Drains which pass under a house must be of cast iron, the most expsive material for pipe drains.
穿過房屋下面的排水管道，必須使用鑄鐵管，這是排水管所用的最昂貴的材料。
