four-colour theorem

• 四色定理

four-colour theorem的用法和样例：

例句

1. The standard four-color theorem defines borders in a way that hews to common sense and excludes bizarre cases such as Hudson's.
   标准四色定理中所用到的边界定义方式与常识相同，排除了哈德逊地图这类诡异的情况。