That invention was the arch, a curved structure originally made of separate stone or brick segments.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。

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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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But they perform together on a makeshift stage inside a brick structure with a roof made out of discarded U.N. bags.

NPR: Circus Brings Joy, Focus to Afghan Children