That invention was the arch, a curved structure originally made of separate stone or brick segments.
这一发明就是拱门，一种最初由分段的石头或砖块组成的弧形结构。
Zhencheng building is made up of two circles: the outside one is earth structure and the inside one is brick structure.
振成楼由内外两环楼构成，外环是土木结构的，内环则是砖木结构。
Zhencheng building is made up of two circles: the outside one is earth structure and the inside one is brick structure.
振成楼由内外两环楼构成，外环是土木结构的，内环则是砖木结构。
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