你不知道的万里长城

犯罪 英国 2014 

状态:HD

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TK资源 ddtw.cc

达达兔C线

剧情介绍

ModernChineseandinternationalresearchusingnewmethodslikedronessystematicallystudiestheGreatwallofChina.Itsvisibilityfromspaceisalegend,butitssizeactuallyranksasworld'slargestmonument.Itneverwasasinglewall,butasystemofseveralsegments,repeatedlyalteredovertime,insuccessiveattemptstopreventinvasionsfromraidertribes,liketheXiongnu,adaptedtotheterrain,withanelaboratesystemofgarrisontowers,advancedtowerpostsandcommunicationsystem.Buildingandmanningitprovedextremelycostly.ItfailedtopreventtheMongolarmiesofGenghisKhanannexingChina,hisgreatsuccessorKublaiKhanbuiltawallsystemtofithislargerempire.AftertheMingdynastyfinallyexpelledtheMongols,the'primitive'wallswerereplacedbythefinalstoneversion,usingabricktypesolidifiedwithricestarch.Whiletheunprecedentedmobilizationofmeansforconstructionandgarrisonscrippledthetreasury,itproveduselessagainstthe...

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