Although many of the churches appear from the outside to be complex structures, they normally feature only a single storey but numerous different roof levels.
2019年12月六级真题(第一套)听力 Section C
柯林斯高阶英汉双解学习词典释义
N-COUNT
(楼房的)层,楼层
A storey of a building is one of its different levels, which is situated above or below other levels.