road·bed 
(rōdbĕd′)
(rōdbĕd′)n.
1.
a. The foundation upon which the ties, rails, and ballast of a railroad are laid.
b. A layer of ballast directly under the ties.
2. The foundation and surface of a road.
| 单词 | roadbed |
| 释义 | road·bed (rōdbĕd′)n. 1. a. The foundation upon which the ties, rails, and ballast of a railroad are laid. b. A layer of ballast directly under the ties. 2. The foundation and surface of a road. |
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