先写一个正四面体的P4（四个P位于正四面体的顶点上）,四面体的棱就是P-P键
再在每两个P的P-P键之间插入一个O,形成P-O-P的形式,这样是6个O
最后再在每个顶点P上双键连接一个O,加上去就是十个O了
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