precipitation
n
1 [U] (fml 文) violent haste 迅急; 匆促; 仓促; 鲁莽
to act with precipitation 仓促行事.
2 [U] separation of a solid substance from the liquid in which it is held 沉淀; 淀析.
3
(a) [C] fall of rain, sleet, snow or hail (雨、 雨夹雪、 雪、 雹子等的)降落
a heavy precipitation 一场大雨(或雨夹雪、 雪、 雹子).
(b) [U] amount of rain, etc thatfalls in an area 某地区降雨等的量
the annual precipitationof the region 该地区的年降雨量.