the water cycle
noun /ðə ˈwɔːtə saɪkl/
/ðə ˈwɔːtər saɪkl/
[usually singular]- the processes by which water passes between the earth's atmosphere, land and oceans, involving water falling from clouds as rain and snow, flowing in streams and rivers to the sea, and then returning to the atmosphere through evaporation and forming clouds again
水循环：水在地球大气层，陆地和海洋之间流动的过程，涉及水从云层（如雨和雪）落下，在溪流和河流中流向海洋，然后通过蒸发返回大气层并再次形成云层 - Rainfall is a key link in the global water cycle and a measure for changing climate.
降雨是全球水循环的一个关键环节，也是衡量气候变化的一个指标。
- Rainfall is a key link in the global water cycle and a measure for changing climate.