新视野大学英语第四册第四单元PPT演示课件.ppt

新视野大学英语第四册第四单元PPT演示课件.ppt

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时间:2020-07-26

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1、ThetelecommunicationrevolutionUnit4Atransformationisoccurringthatshouldgreatlyboostlivingstandardsinthedevelopingworld.Placesthatuntilrecentlyweredeafanddumbarerapidlyacquiringup-to-datetelecommunicationsthatwillletthempromotebothinternalandforeigninvestment.Itmaytakeadecadeformanycountriesin

2、Asia,LatinAmerica,andEasternEuropetoimprovetransportation,powersupplies,andotherutilities.Butasingleopticalfiberwithadiameteroflessthanhalfamillimetecancarrymoreinformationthanalargecablemadeofcoppewires.Byinstallingopticalfiber,digitalswitches,andthelatestwirelesstransmissionsystems,aparadeo

3、furbancentersandindustrialzonesfromBeijingtoBudapestaresteppingdirectlyintotheInformationAge.Aspider'swebofdigitalandwirelesscommunicationlinksisalreadyreachingmostofAsiaandpartsofEasternEurope.worktoindustriesthatinvolveengineering,marketing,anddesign.Moderncommunications"willgivecountriesli

4、keChinaandVietnamahugeadvantageovercountriesstuckwitholdtechnology".Howfastthesenationsshouldpushaheadisamatterofdebate.ManyexpertsthinkVietnamisgoingtoofarbyrequiringthatallmobilephonesbeexpensivedigitalmodels,whenitisdesperateforanyphones,period."Thesecountrieslackexperienceinweighingcostsa

5、ndchoosingbetweentechnologies,"saysoneexpert.Still,there'slittledisputethatcommunicationswillbeakeyfactorseparatingthewinnersfromthelosers.ConsiderRussia.Becauseofitsstrongeducationalsysteminmathematicsandscience,itshouldthriveintheInformationAge.Theproblemisitsnationalphonesystemisarustingan

6、tiquthatdatesfromthel930s.Tolickthisproblem,Russiaisstartingtoinstallopticalfiberandhasastrategicplantopump$40billionintovariouscommunicationsprojects.Butitseconomyisstuckinrecessionanditbarelyhasthemoneytoevenscratchthesurfaceoftheproblem.ComparethatwiththemainlandofChina.Overthenextdecade,i

7、tplanstopoursome$100billionintotelecommunicationsequipment.Inaway,China'sbackwardnessisanadvantage,becausetheexpansionoccursjustasnewtechnologiesarebecomingcheaperthancopperwiresystems.Bytheendof1995,eachofChina'sprovincialcapitalsexceptforLh

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