单词	roadbed
释义	roadbed /ˈrəʊdbɛd / noun 1The material laid down to form a road.Add such attachments as scarifiers, and graders can even tear up old roadbeds.... Culverts - metal, plastic or concrete pipes installed under roadbeds to channel runoff - are not always the best solution for drainage, but they are common and sometimes necessary. A minority of these roads, although listed with a carriageway of constant thickness, may have had a similar surface profile, provided the roadbed on which they were formed had a central camber. 1.1North American The part of a road on which vehicles travel.These carefully concealed elevators, built within the highway tunnels located in Portland's West Hills, will have the capacity to lift both vehicles and helicopters to the highway roadbed.... The board said it believes someone crept down to the dusty roadbed after the last vehicle went by and dug in a mine to catch the next passing vehicle. Road damage starts when buses and other heavy vehicles over a certain weight threshold cause the roadbed to flex and crack. 1.2 another term for trackbed.The men who built this railway had to hang suspended by ropes from vertical cliffs, blasting and hacking out a roadbed.... This marker also stands on the abandoned roadbed of the St. Paul and Southern Railway.
随便看	retroreflection retroreflective retroreflector retrorocket retrorse untenanted untended untenured Untermensch Untermeyer, Louis untestable untested untether unthanked unthankful unthankfully unthankfulness unthaw untheorised untheorized unthinkability unthinkable unthinkableness unthinkably unthinking

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