单词：drain-pipe
drain-pipe的用法和样例：
例句
- 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。
- Drains which pass under a house must be of cast iron, the most expsive material for pipe drains.穿过房屋下面的排水管道，必须使用铸铁管，这是排水管所用的最昂贵的材料。
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