资料来源 : pyDict

路基

资料来源 : Webster's Revised Unabridged Dictionary (1913)

Roadbed \Road"bed`\, 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.

资料来源 : WordNet®

roadbed
     n : a bed supporting a road