颜色分类处理使用特征函数，可以减少颜色坐标转换运算，提高颜色分类速度。
Characteristic function is used for color classification, which can reduce the operation of color coordinate conversion and improve the speed of color classification.
函数重载和运算符重载的两种松软的东西——有许多面向对象的语言不支持这2种特征。
Function overloading and operator overloading are two such fluffy things - there are many OO languages that don't support those 2 features.
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