Razing existing structures to prepare for new development is standard practice in urban planning.
拆掉现有的建筑物来为新一轮建设扫清障碍，这是城市规划的惯例。
That\\\'s hard to say, because the existing building structures are much, much larger.
很难说，因为那里的建筑结构种类实在太多。
May restore, clean or paint existing masonry structures.
可以恢复，清洁或刷油漆为现有的砖石结构。
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。
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。
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