- 问题详情:Forcenturies,theonlyformofwrittencorrespondence(通信)wastheletter.Letterswere,andare,sentbysomeformofpostalservice,thehistoryofwhichgoesbackalongway.Indeed,theEgyptiansbegansendinglettersfromabout2000BC,asdidtheChineseathousandyearslater. Of...
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