A dial tone is not sent in some telephone networks.

在某些电话网络中不发送拨号音。

youdao

Public Switch Telephone Network is one of mature networks.

公共交换电话网是成熟的网络之一。

youdao

So let's talk about convergence, convergence of the internet, telephone and television networks.

因此让我们讨论一下聚合，互联网，电话和电视网络的聚合。

youdao

So let's talk about convergence, convergence of the internet, telephone and television networks.

因此让我们讨论一下聚合，互联网，电话和电视网络的聚合。

youdao