EINinoisthenamegiventothemysteriousandoftenunpredictablechangeintheclimateoftheworld.Thisstrange47happenseveryfivetoeightyears.ItstartsinthepacificOceanandisthoughttobecausedbyafailureinthetradewinds(信风),whichaffectstheoceancurrentsdrivenbythesewinds.Asthetradewindslessenin48,theoceantemperaturesrise,causingthePerucurrentflowinginfromtheeasttowarmupbyasmuchas5℃.
EINinousuallylastsforabout18months.The1982-83EINinobroughtthemost52weatherinmodernhistory.Itseffectwasworldwideanditleftmorethan2,000peopledeadandcausedovereightbillionpounds53ofdamage.The1990EINinolasteduntilJune1995.Scientists54thistobethelongestEINinofor2,000years.
Nowadays,weatherexpertsareabletoforecastwhenanEINinowill55,buttheyarestillnot56surewhatleadstoitorwhataffectshowstrongitwillbe.沪江四六级http://cet.hjenglish.com
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