superstructures

/ˈsuː.pɚˌstrʌk.tʃɚ/

名词

（建筑物的）上部结构，上层建筑物
The foundations are finished and work has now begun on building the superstructure of the new library.
新图书馆的地基已经打好，现在已经开始修建上部结构了。