更多和更多的既有地下构筑物开始老化了。
More and more existing underground structures are starting to age.
更多的地下构筑物建造在建筑物密集的地区。
More and more underground structures are built in the densely built areas.
对坝基内部原有输水洞这一特殊的地下构筑物，采用了多设备组合施工的方法。
The construction scheme and technique, used in the anti-seepage treatment of Bayi reservoir dam, are introduced, with a method of dealing with special underground structure inside the dam.
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