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主要从系统的、全程全网的观点来描述移动电话整个计费业务所涉及的内容和范畴，以求达到对移动电话的计费业务有比较全面了解的目的。
Mainly from the system, the entire network from the point of view to describe the entire mobile phone billing business involving the content and scope, in order to achieve the billing business of mobile phones have a more comprehensive understanding of the purpose.