第四十四条 国家加强运输通道及装备体系建设，保障放射性物品的公路、铁路、水路、航空等运输。
Imagine a vast shopping mall parking lot with thousands of individual parking spots and internal lanes (representing road segments within a cluster). No matter how complex it is inside, there are usually only a few key exits to the main roads. Our goal was to identify these natural "exits" for each map cluster. For instance, the complex road network around Amsterdam Airport Schiphol (see on OpenStreetMap) has many internal roads but limited primary access points.
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太行深处，河北阜平骆驼湾村，平整道路随山势蜿蜒，把小山村接入交通网。
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