Roadbed

['rəʊdbed] or ['rod,bɛd]

解釋/意思:

(noun.) a bed supporting a road.

艾伦整理--From WordNet

解釋/意思:

(n.) In railroads, the bed or foundation on which the superstructure (ties, rails, etc.) rests; in common roads, the whole material laid in place and ready for travel.

西莉亚手打