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英语翻译Whatmakesitrain?RainfallsfromcloudsforthesamereasonasanythingfallstotheEarth.TheEarth'sgravitypullsit.Buteverycloudismadeofwaterdroplets(微滴)oricecrystals(结晶).Whydoesn'trainorsnowfallcontinuously
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英语翻译

Whatmakesitrain?RainfallsfromcloudsforthesamereasonasanythingfallstotheEarth.TheEarth'sgravitypullsit.Buteverycloudismadeofwaterdroplets(微滴)oricecrystals(结晶).Whydoesn'trainorsnowfallcontinuouslyfromallclouds?Thedropletsoricecrystalsincloudsareverysmall.Theeffectofgravityonthemistiny.

Dropletsandicecrystalsactsomewhatlikedustintheairwhichismadevisible(可见的)intheraysofsunlight.Tothecarelessobserver,dustseemstoactinatotallydisorderly(混乱的)waymovingaboutfreelywithoutfixeddirection.Butinfactdustparticlesaremuchlargerthanwaterdropletsandtheyfinallyfall.

Theclouddropletofordinarysizeisonly1/2500inchindiameter(直径).Itissosmallthatitwouldtakesixteenhourstofallhalfamileinperfectlystillair,anditdoesnotfalloutofmovingairatall.Onlywhenthedropletgrowstoadiameterof1/125inchorlargercanitfallfromthecloud.Theordinaryraindrophasamilliontimesasmuchwaterasatinyclouddroplet.Thegrowthofaclouddroplettoasizelargeenoughtofalloutisthecauseofrain.

陈鼎昌回答:
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