A concrete frame creates long spans that allow for column-free rooms on each level.

混凝土框架采用了长跨度，这样每个水平面可以有无柱的房间。

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The facade, which contains a total of 350 Windows, allows for vast column-free Spaces internally on the building's two main levels.

立面总共包含350个窗户，允许在建筑物内部的两个主要楼层内建立大型无柱空间。

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To guarantee the column-free space effect, all the emergency staircases, ventilating pipes and other auxiliary functions are gathered into the central concrete core.

疏散楼梯、通风管道等辅助性功能集中在中央的混凝土核心里，确保获得无柱的展厅。

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The steel structure will form the basis of the 11, 000 sqm (118, 400 sq ft) column-free roof.

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Editorial writer Rapheal Reece-Harrel(ph) has used his column in the free paper Metro to exhort Mexicans to participate in response to widespread marches in the United States.

NPR: Immigration Activists Target U.S. Businesses in Mexico