二级数据提供了一个背景，移动电话行业和客户交换行为的概述服务。
Secondary data provided a background to the mobile phone industry and an overview of customer switching behaviour in services.
二级数据提供了一个背景，移动电话行业和客户交换行为的概述服务。
Secondary data provided a background to the mobile phone industry and an overview of customer switching behaviour in services.
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