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substructure

noun
🔊/ˈsʌbstrʌktʃə(r)/
🔊/ˈsʌbstrʌktʃər/
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  1. a base or structure that is below another structure and that supports it基础；下部结构；下层建筑
    • a substructure of timber piles木桩下部结构
    • (figurative) the substructure of national culture民族文化的基础
    compare superstructureTopics Buildingsc2