降水的英文：
hygrometric
precipitation

参考例句：

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

radar measurement of precipitation
雷达测量降水

probable maximum precipitation
可能最大降水

Heavy vegetation may intercept a large amount of precipitation on its leaves.
浓密的植被的叶子中能截留大量的降水。

The month began and ended quite dry, but the middle fortnight saw nearly 100mm of rain fall nationwide.
本月月初和月末颇为干燥， 不过中旬的两周全国有将近100毫米的降水。

hygrometric是什么意思：
测湿; 降水
precipitation是什么意思：
n. 降落；降水量；沉淀（物）；鲁莽；冰雹

That was a precipitous decision.
那是一个轻率的决定。

An agent that precipitates or is capable of precipitating such a state.
骚动的原因引起或能引起这种状态的原动力

precipitate a country into a crisis
使一个国家突然陷入危机

precipitate oneself into(danger)
使自已陷入(危险)

All this will precipitate an economic crisis.
所有这些会促成经济危机。