This gigantic and arduous house renovation project is rarely found in the world urban construction history. 这一庞大而艰巨的危旧房改造计划，在世界城市史上是少有的。
However, in Chinese ancientry city history, we find that public leisure places all long disposte relatively edge status in cities, especially in capital before Tang Dynasty. 但在中国古代城市史中，我们发现，这一空间类型在城市中，尤其是唐代以前的都城中一直是处于较为边缘的地位的。
