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众所周知,三角形有五个心,而内心与外心则是里面最为常用的两个,现在就内心和外心的联合使用作一探讨,首先先介绍一个性质;
As we all know, the triangle has five hearts, and the inner heart and the outer heart are the two most commonly used ones. Now we will discuss the joint use of the inner heart and the outer heart. First of all, we first introduce a property.