将ABC的各外角三等分，每两个外角的相邻的三等分角线相交得DEF，称之为西ABC的外莫莱三角形．由文[1]知AD、BE、CF相交于一点．对于△ABC的外莫莱三角形△DEF,有如下性质．定理△ABC与其外莫莱三角形△DEF对应顶点连线AD、BE、CF共点于西ABC的内心的充要条件是bABC为正三角形? The outer corners of ABC are divided into three equal parts, and the adjacent three-divided corners of each outer corner intersect with each other to obtain DEF, which is called the outer Morole triangle of West ABC. It is known by [1] that AD, BE, and CF intersect at one point. For △ ABC outside Mole delta △ DEF, have the following properties. Theorem △ABC and its external Mole delta △DEF corresponding to the vertex connection AD, BE, CF common point in the heart of West ABC is a necessary and sufficient condition for bABC is a regular triangle?