1. benzenoid system) and coronoid systems are the natural representations of the skeletons of molecules of benzenoid hydrocarbons and coronoid hydrocarbons in the field of organic chemistry.
   六角系统(苯环系统)和冠状系统分别是有机化学领域中的苯碳氢化合物和冠状碳氢化合物的分子结构的自然体现。
2. An essentially disconnected polyhex graph is defined as a benzenoid system or a coronoid system which has fixed bonds and some Kekulé structures.
   摘要本质不连通多六隅图定义为含有固定键且含有完美匹配的苯环系统或冠状系统。

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