1. 电话局：satellite communications卫星通信 | telephone exchange电话局 | telephone, phone电话,电话机

2. 电话交换机：telephone directory 电话薄 | telephone exchange 电话交换机 | telephone extension 电话分机

3. 电话交换：telephone connection 用户终端 | telephone exchange 电话交换 | telephone network 电话网络

4. 电话交换台：telephone conduit | 电话线管 \r\n | telephone exchange | 电话交换台 \r\n | telephone pole | 电杆 \r\n

1. 电话交换台;总机;电话局
A telephone exchange is a building where connections are made between telephone lines.

noun

1. a workplace that serves as a telecommunications facility where lines from telephones can be connected together to permit communication

Synonym: centralexchange