The fancy mathematical name he has for this map is a “social graph”, a model of nodes and links in which nodes are people and connections are friendships.
他给这一地图起了一个富于想象力而又很数学化的名字“社会图”，它是一个由节点和连接节点的线组成的数学模型，其中节点就是一个个的人而人与人的连线则代表他们的友谊。
Map model is a foundation of map use, mathematical models of map and computer-assisted cartography.
地图模型是地图应用、地图数学模型和计算机地图制图的基础。
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