舞池两侧，专门接待日本客人、手下都是“老虎”的两位“公公”不时在各自的小姐身边逡巡，神情警觉，又有点闷闷不乐。一晚上，偶尔出现的几只“猎物”，也会被他们抢夺分食，而生存最大的资本就是小姐的本事。
Source: Computational Materials Science, Volume 267
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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.