n. 坠落, 沉淀, 降水, 轻率, 急速, 猛冲, 突如其来

[化] 析出

n. the quantity of water falling to earth at a specific place within a specified period of time

n. the process of forming a chemical precipitate

n. the falling to earth of any form of water (rain or snow or hail or sleet or mist)