underpinning
n. 基础,基础材料;[矿业] 支柱,支承结构;支撑
n.基础,支柱,支撑
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n. 基础,基础材料;[矿业] 支柱,支承结构;支撑
n.基础,支柱,支撑
barbital mackinaw obumbrant preinvasion strathclyde superhero varisized