fall pipe

例句：

1. 1. The gardener needs to repair the fall pipe in the back yard.
   园丁需要修理后院的落水管。
2. 2.The old house has a leaky fall pipe that needs fixing immediately.
   这所老房子有一个漏雨的落水管，需要立即修理。
3. 3. The plumber replaced the old fall pipe with a new one to prevent future leaks.
   管道工用一个新的落水管替换了旧的，以防止将来的泄漏。