英语翻译A33-year-oldfinancialanalystinCaliforniarecentlyquithisjobtodevotehimselftoanunpaidjobteachingmathontheInternet,andhislessonsarereachingalmost100,000peopleamonth.SalmanKhan’svoiceisheardeverydayonth

　　英语翻译

　　A33-year-oldfinancialanalystinCaliforniarecentlyquithisjobtodevotehimselftoanunpaidjobteachingmathontheInternet,andhislessonsarereachingalmost100,000peopleamonth.SalmanKhan’svoiceisheardeverydayonthenet---bytensofthousandsofstudentsaroundtheworldwhoarehungryforhelplearningmath.Hehasposted1,200lessonsonYouTube...lessonsthatappearonanelectronicblackboard,whichrangefrombasicadditiontoadvancedmathematicsforscienceandfinance.Andtheyarefree.

　　KhanlivesinSiliconValley,withhiswife,adoctor,andtheirnewbaby.Hegottheideaforhis“KhanAcademy”fouryearsago,whenhetaughtayoungcousinhowtoconvertkilogramstograms.WithKhan’shelp,thecousingotgoodatmath,andKhanbegananewcareer.

　　Now,Khanrecordshislessonshimself,buthenevergoesoncamera.“Itfeelslikemyvoiceintheirhead.You’relookingatitanditfeelslikesomeone’soveryourshouldertalkinginyourear,asopposedtosomeoneattheblackboard,whichisdistantfromyou,”hesaid.

　　WhenSpringfieldHighSchoolinPaloAlto,CaliforniainvitedKhantospeakinperson---heimmediatelyconnectedtothestudentsthere.

　　TheideaofshortlessonsthatcanbeplayedoverandoveragainattractedhighschoolseniorBridgetMeaney.Shesaysshehadtroublewithmathintheseventhgrade.“Ithinktheteachersaregood,buttheycan’tteachataspeedthat’sperfectforeveryone,”shesaid.“Iliketheideaoflearningsomethinginclassbutthengoingbackandpressingpauseorrewindandactuallygettingadeeperunderstandingofit.”

　　Originally,KhankepthislessonsshortbecauseofYouTuberestrictions.Now,hethinksshortisbetter.“Educationresearchersnowtellmethat10minutesishowlongsomeonecanhaveahighlevelofconcentration.Andanythingbeyondthatandyourbrainswitchesoff,”hesaid.

　　ForKhan,teachingmath,science,andfinanceisjustthebeginning.Hesayshe’sreadytoexpandhisYouTubesitetoincludeothersubjectsaswell.