su·per·struc·ture /-ˌstrʌkʧɚ/
  上部構造,建築物,上層建築
  Su·per·struc·ture n.
  1. Any material structure or edifice built on something else; that which is raised on a foundation or basis; esp. Arch., all that part of a building above the basement. Also used figuratively.
     You have added to your natural endowments the superstructure of study.   --Dryden.
  2. Railway Engin. The sleepers, and fastenings, in distinction from the roadbed.
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  superstructure
       n : structure consisting of the part of a ship above the main
           deck