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漫漫320国道,犹如一条蜿蜒起伏的巨龙,东起上海西至瑞丽边境,穿山越岭,逶迤3600多公里。尤其是进入至今尚无铁路,交通运输全部依赖公路的横断山南部腹地以后,更是成了滇西经济的生命线。其中最具有代表性的一段是永(平)保(山)桥至龙陵
Long Road 320, like a winding dragon, east from west to Ruili border, mountain, ridge, more than 3600 kilometers. In particular, it has become the lifeline of the economy in western Yunnan even after it has entered the hinterland of the southern Hengduan Mountains, where no railway has yet been built up and the transportation is totally dependent on the highway. One of the most representative section is Wing (Ping) Paul (Hill) Bridge to Longling