ModernChineseandinternationalresearchusingnewmethodslikedronessystematicallystudiestheGreatwallofChina.Itsvisibilityfromspaceisalegend,butitssizeactuallyranksasworld'slargestmonument.Itneverwasasinglewall,butasystemofseveralsegments,repeatedlyalteredovertime,insuccessiveattemptstopreventinvasionsfromraidertribes,liketheXiongnu,adaptedtotheterrain,withanelaboratesystemofgarrisontowers,advancedtowerpostsandcommunicationsystem.Buildingandmanningitprovedextremelycostly.ItfailedtopreventtheMongolarmiesofGenghisKhanannexingChina,hisgreatsuccessorKublaiKhanbuiltawallsystemtofithislargerempire.AftertheMingdynastyfinallyexpelledtheMongols,the'primitive'wallswerereplacedbythefinalstoneversion,usingabricktypesolidifiedwithricestarch.Whiletheunprecedentedmobilizationofmeansforconstructionandgarrisonscrippledthetreasury,itproveduselessagainstthe...
2025-11-29 12:20:30，最后更新于 7天前
相关推荐TUIJIAN