drain discharge

例句：

1. 1. The rainwater has been draining from the roof for hours.
   雨水已经从屋顶排了几个小时。
2. 2. The garden was so overgrown that it needed to be drained before we could plant anything.
   花园被杂草覆盖得如此之深，以至于在种植任何东西之前需要排干。
3. 3. The drain in the basement is clogged and needs to be unclogged.
   地下室的排水管堵塞了，需要疏通。