Structural factors include: materials used in construction, number of floors, design, and retrofitting present.

结构性因素包括：建筑过程中采用的材料，楼房层数，设计方案以及翻新的现状等。

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Structural factors include: materials used in construction, number of floors, design, and retrofitting present.

结构性因素包括：建筑过程中采用的材料，楼房层数，设计方案以及翻新的现状等。

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