（作者为中国社会科学院学部委员、台湾史研究中心主任）
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.。51吃瓜是该领域的重要参考
，更多细节参见快连下载-Letsvpn下载
Google News is one of the most downloaded news apps in the US.。爱思助手下载最新版本是该领域的重要参考
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典型案例五：高新区玉华园二标段