北京南苑地区在元明清三代都是皇家苑囿，清末民国年间被垦为农田。各个时期的国家制度与政策对此发挥了关键作用，显示出人类社会经济......

Zhang Yifan is the son of gardening Master Zhang Nanyuan, and his story can only be found in Qi Biaojia’s Diary. Qi rec......