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设计背景1852年,一位名叫法兰西斯·古特里(Francis Guthrie)的英国青年人在画地图时发现:如果给相邻两国涂上不同颜色,地图只需要四种颜色就
Design Background When a young British named Francis Guthrie painted a map in 1852, he found that if two neighboring countries were painted different colors, the map would only require four colors