More and more existing underground structures are starting to age.
更多和更多的既有地下构筑物开始老化了。
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。
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。
It is in the construction of underground structures that bolting has had its greatest application.
介绍在地下结构的建筑闩上它才有最巨大的应用。
It is in the construction of underground structures that bolting has had its greatest application.
介绍在地下结构的建筑闩上它才有最巨大的应用。
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