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Middle column of large underground structures is the weak link in seism.
大跨度地下结构中柱是抗震薄弱环节。
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More and more underground structures are built in the densely built areas.
更多的地下构筑物建造在建筑物密集的地区。
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More and more underground structures are built in the densely built areas.
更多的地下构筑物建造在建筑物密集的地区。
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