Thinkaboutthedifferentwaysthatpeopleusethewind.Youcanuseittoflyakiteortosailaboat.Windisoneofourcleanestandrichestpowersources(来源),aswellasoneoftheoldest.Evidenceshowsthatwindmills(风车)begantobeusedinancientIranbackintheseventhcenturyBC.TheywerefirstintroducedtoEuropeduringthe1100s,whenarmiesreturnedfromtheMiddleEastwithknowledgeofusingwindpower.Formanycenturies,peopleusedwindmillstogrind(磨碎)wheatintoflourorpumpwaterfromdeepunderground.Whenelectricitywasdiscoveredinthelate1800s,peoplelivinginremoteareasbegantousethemtoproduceelectricity.Thisallowedthemtohaveelectriclightsandradio.However,bythe1940swhenelectricitywasavailabletopeopleinalmostallareasoftheUnitedStates,windmillswererarelyused.Duringthe1970s,peoplestartedbecomingconcernedaboutthepollutionthatiscreatedwhencoalandgasareburnedtoproduceelectricity.Peoplealsorealizedthatthesupplyofcoalandgaswouldnotlastforever.Then,windwasrediscovered,thoughitmeanshighercosts.Today,thereisaglobalmovementtosupplymoreandmoreofourelectricitythroughtheuseofwind.(求大神翻译)
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