英语词汇“subgrade”是什么意思，“subgrade”的读音、用法及例句翻译-烛光网

词汇	subgrade
释义	sub·grade AHD[sŭbʹgrād'] D.J.[ˈsʌbˌgreɪd]K.K.[ˈsʌbˌgred]n.（名词） The level layer of rock or earth upon which the foundation of a road or railway is laid.路基，地基：在其上铺设路的基础或铁路道碴的岩石或泥土的水平层
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