substructure

/'sʌb'strʌkʃn/ Cách viết khác : (substructure) /'sʌb,strʌktʃə/
Noun
  1. lowest support of a structure
    • it was built on a base of solid rock
    • he stood at the foot of the tower
  2. the basic structure or features of a system or organization

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substructure
The new building's substructure rests on deep concrete pilings.