名词

1. There will be precipitation on northern hills tonight.
今夜北面山上有降雨。

1. 沉淀：凝集(coagulation)和沉淀(precipitation):原水也含悬浮物质(如油),必须将之去除(至1ppm以下)以防止起泡及锅炉沉积. 极小的颗粒不会沉降下来,且会穿透过滤器. 要除去这些微细颗粒(通常为胶体(colloidal)物质)须用凝集剂.

2. 沉淀反应：沉淀反应 (precipitation)一种血清学反应. 可溶性抗原与相应抗体结合,在有适量电介质存在下,经过一定时间,形成肉眼可见的沉淀物. 沉淀反应的抗原可以是多糖、蛋白质、类脂等. 同相应抗体比较,抗原的分子小,单位体积内含有的抗原量多,

1. 降水
Precipitation is rain, snow, or hail.

2. 沉淀；沉析
Precipitation is a process in a chemical reaction which causes solid particles to become separated from a liquid.

noun

1. overly eager speed (and possible carelessness)

e.g. he soon regretted his haste

Synonym: hastehastinesshurryhurriedness

2. an unexpected acceleration or hastening

e.g. he is responsible for the precipitation of his own demise

3. the act of casting down or falling headlong from a height

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

Synonym: downfall

5. the process of forming a chemical precipitate

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

e.g. the storm brought several inches of precipitation