如今,环路、高架、隧道、经纬线,已经构成很多城市的主网络,也是城与城之间彼此区别开的独特脉络,也成为旧城向新城转身的一道鲜明的标识。环绕北京城的那几个圆如果说旧时的“紫禁城就是北京城、北京城就是紫禁城”一点不为过。时光荏苒几十年,旧时的北京城在版图上已如湖 Nowadays, the loop, elevated, tunnel, longitude and latitude lines, which constitute the main network of many cities, are also the unique contexts in which cities and cities are distinguished from each other, and also become a distinctive sign of the old city turning around to Newtown. Those few circles around Beijing city say “the Forbidden City is Beijing and the Beijing city is the Forbidden City.” Time flies for decades, the old city of Beijing in the territory of the lake