runoff gathering

例句：

1. 1. The stream is a natural runoff gathering system that helps to filter the water before it reaches the river.
   这条小溪是一个自然的径流收集系统，它帮助过滤水，使其在流入河流之前得到净化。
2. 2. The city has implemented a program to collect runoff from rooftops and store it for future use.
   该市实施了一个项目，从屋顶收集径流并将其储存起来，以备未来使用。
3. 3.The farmers have organized a runoff gathering event to raise awareness about the importance of sustainable farming practices.
   农民们组织了一次径流收集活动，以提高对可持续农业实践重要性的认识。