runoff generatingprecipitation

例句：

1. 1.The rainwater from the roof runs off into the gutter.
   屋顶的雨水顺着管道流到排水沟里。
2. 2.The stream that flows through the park is a popular spot for picnicking.
   穿过公园的小溪是野餐的好去处。
3. 3.The water in the river has been running off due to heavy rainfall.
   由于大雨，河里的水一直在流失。