该模型是一个封闭的循环系统，使得运营商开展客户保持工作可以循环接续下去。

The model and the work of customer retaining of operators are a recurrent system.

youdao

该模型是一个封闭的循环系统，使得运营商开展客户保持工作可以循环接续下去。

The model and the work of customer retaining of operators are a recurrent system.

youdao