这就意味着目前存在的面向连接的和电路交换的网络必须升级，以便能够支持分组交换的数据业务。

This means that many of the existing connection-oriented or circuit-switched networks will need to be upgraded to support packet-switched data traffic.

youdao

这就意味着目前存在的面向连接的和电路交换的网络必须升级，以便能够支持分组交换的数据业务。

This means that many of the existing connection-oriented or circuit-switched networks will need to be upgraded to support packet-switched data traffic.

youdao