Vault: in building construction, an arched structure forming a ceiling or roof.
拱顶:房屋建造中用拱作成的天花板或屋顶。
2
A structure or other object resembling such a hemispherical roof or vault.
类似于穹隆或圆屋顶的结构或物体。
3
The roof of a limestone precomminution storage of the Changchun Shuangyang Cement Mill has been completed currently as the largest span vault root steel structure in our country.