单词 | roadbed |
释义 | roadbednoun road·bed ˈrōd-ˌbed 1 a : the bed on which the ties, rails, and ballast of a railroad rest b : the ballast or the upper surface of the ballast on which the ties rest 2 a : the earth foundation of a road prepared for surfacing b : the part of the surface of a road traveled by vehicles |
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