substructure
noun /ˈsʌbstrʌktʃə(r)/
/ˈsʌbstrʌktʃər/
- 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
- a substructure of timber piles