交通工程专业英语Unit1TheEvolutionofTransport交通工具的演化ﻩTheevolutionoftransporthasbeencloselylinkedtothedevelopmentofhumankindthroughouttheearth’shistory
Transport’searlyfunctionwastomeetthebasicneedofhaulingfoodsuppliesandbuildingmaterials
Butwiththeformationoftribes,thenpeoples,andfinallynations,thesocietalandeconomicfunctionsoftransportbecamemoreandmorecomplex.Atfirsttherewasmobilityrequiredforindividuals,clans,households,andanimalstoprotectthemagainst,andtoescapefrom,thedangersofnaturaldisastersandtribalaggressions,andinthesearchforthebestplacestosettle
Astribalgroupsformedandgraduallyestablishedtheirgeographicalidentity,transportwasincreasinglyneededtoopenupregionsfordevelopment,toprovideaccesstonaturalresources,topromoteintercommunaltrade,andtomobilizeterritorialdefense
Whenthefirstnationscamein