问题描述：
the dexelopment of modern cities,both in population size and in functionality,necessitates the rem
the development of modern cities,both in population size and in functionality,necessitates the removal of certain existing structures whose history can often be traced back to centuries ago.
the development of modern cities,both in population size and in functionality,necessitates the removal of certain existing structures whose history can often be traced back to centuries ago.
问题解答：
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