precipitation

名词 precipitation:

1. the quantity of water falling to earth at a specific place within a specified period of time
2. the process of forming a chemical precipitate
3. the falling to earth of any form of water (rain or snow or hail or sleet or mist)
   同义词：downfall
4. the act of casting down or falling headlong from a height
5. an unexpected acceleration or hastening
6. overly eager speed (and possible carelessness)
   同义词：haste, hastiness, hurry, hurriedness

1. Precipitation in the form of pellets of ice and hard snow.
   冰雹以冰和硬雪块颗粒的形式下落
2. The treatment of metal or the separation of metal from ores and ore concentrates by liquid processes, such as leaching, extraction, and precipitation.
   水冶金术通过液体过程，象过滤，提炼，沉淀等方法处理金属，从矿石中或矿石浓缩物中分离出金属
3. There will be precipitation on northern hills tonight.
   今夜北部山区有降雪。

pre.cip.i.ta.tion

n.（名词）
A headlong fall or rush.
猛然落下或冲下
Abrupt or impulsive haste.
急躁或冲动
A hastening or an acceleration, especially one that is sudden or unexpected:
陡然，促然：尤指突然的或出乎意料的急促或加速：
例句：
He is responsible for the precipitation of his own demise.
他得为自己的卒死负责

Abbr. pptn.Meteorology
缩写 pptn.【气象学】
Any form of water, such as rain, snow, sleet, or hail, that falls to the earth`s surface.
降水：暴雨、雪、冻雪或冰雹降落到地表的任何形式的水
The quantity of such water falling in a specific area within a specific period.
降水量：某一特定时期内特定区域的降水数量
Chemistry The process of separating a substance from a solution as a solid.
【化学】 沉淀：把物质从溶液中分解为固体的过程