下水管

例句：

1. 1. The drain in the kitchen is clogged with food waste.
   厨房的排水管被食物残渣堵塞了。
2. 2. The sewer system needs to be unclogged to prevent flooding.
   下水道系统需要疏通以防止洪水。
3. 3. The rainwater was successfully unsewage from the basement.
   雨水成功地从地下室排走了。