中英▼

  • The number of lines and traffic of the Public Switched Telephone network (PSTN) network have also been decreasing.

    公共电话交换网(PSTN)的线路和流量也在减少。

    youdao

  • The number of lines and traffic of the Public Switched Telephone network (PSTN) network have also been decreasing.

    公共电话交换网(PSTN)的线路和流量也在减少。

    youdao

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