Brand is a complete business system, brand loyalty is the core of the system.
品牌是一个完整商业系统，品牌忠诚是这个系统的核心。
The billing system is the core competitive power of the telecommunication business.
电信业务的计费系统是电信运营商的核心竞争力之一。
The billing system is the core competitive power of the telecommunication business.
电信业务的计费系统是电信运营商的核心竞争力之一。
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