接口：站与网络间的接口，在电话系统中称为本地环路。

Interfaces: the interfaces between the stations and the network, referred to in the phone system as the local loops.

youdao

接口：站与网络间的接口，在电话系统中称为本地环路。

Interfaces: the interfaces between the stations and the network, referred to in the phone system as the local loops.

youdao