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1引言为期半年的世界园艺博览会将于2006年在中国沈阳召开，世园会以沈阳植物园和正在建设的北区为核心区域，随地势建设的环状路网构成的主次两条观光线路，连接着园区内的20个国际庭院、52个国内庭院、23个专类庭院以及各个园艺展示区、休闲娱乐区、综合服务区和展会活动区，世园会南区主路见图1。
1 Introduction The six-year Horticultural Exposition will be held in Shenyang, China in 2006. The Horticultural Exposition will take the Shenyang Botanical Garden and the North Area under construction as the core area. With the two major tourist routes formed by the ring road network with topographical features, It connects with 20 international courtyards, 52 domestic courtyards, 23 special courtyards and various horticultural exhibition areas, leisure and entertainment areas, integrated service areas and exhibition activity areas. The main road of Huanan District Southern District is shown in Figure 1.