为了使维系成本发挥最大效益，运营商必须采用差异化的维系政策。

In order to maintain the most cost-effective, operators must maintain a difference of policy.

youdao

为了使维系成本发挥最大效益，运营商必须采用差异化的维系政策。

In order to maintain the most cost-effective, operators must maintain a difference of policy.

youdao