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保险，在法律和经济学意义上，是种风险管理方式，主要用于经济损失的风险。保险被定义为透过缴纳一定的费用，将一个实体潜在损失的风险向一个实体集合的平均转嫁。
其实通俗地讲，就是一旦加入某个团体，就“一人...