英语词汇“roadbed”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

单词	roadbed
释义	Word Frequency roadbed (ˈrəʊdˌbɛd) noun 1. the material used to make a road 2. a layer of ballast that supports the sleepers of a railway track
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