| 单词 | subgrade |
| 释义 | subgrade /sub"grayd'/, Civ. Engin., Building Trades. n. 1. the prepared earth surface on which a pavement or the ballast of a railroad track is placed or upon which the foundation of a structure is built. adj. 2. beneath the finished ground level of a project. [1895-1900; SUB- + GRADE] |
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