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降低旧城人口密度作为保护北京旧城的手段之一,首次以法律形式固定下来。2005年3月28日,《北京历史文化名城保护条例》
Reducing the population density of the old city as one of the means of protecting the old city of Beijing was fixed for the first time by law. March 28, 2005, “Beijing historical and cultural city protection regulations”