英语翻译
之前的没发出.
TheRomansboundtheirempiretogetherwithanextensivesystemofroadsfromRome.Someoftheseearlyroadswereofelaborateconstruction.Firstatrenchwasexcavatedtosuchadepththatthefinishedsurfacewouldbeatgroundlevel.Thepavementwasplacedinthreecourses;alayerofsmallbrokenstones,alayerofsmallstonesmixedwithmortarandfirmlytampedintoplace,andawearingcourseofmassivestoneblocks,setandbeddedinmortar.SomeoftheRomanroadsarestillinexistencetoday.AndmanymodernhighwaysfollowtheancientRomanroutes.