a telephone line connecting two exchanges directly
例句
用作名词 (n.)
The railway line comes to the airport. 铁道干线直达飞机场。
It all fit easily into the trunk of the cruiser. 这一切都适合容易进入干线的巡洋舰。
Bulk Encryption Simultaneous encryption of all channels of a multichannel telecommunications trunk. 集中加密多信道电信中继线中所有信道同时加密。
This requires new kinds of circuit-switching gateways that feature LAN interfaces and telephony trunk connections to public networks and PBXs. 这就要求用新型的电路交换网关，它们具有局域网接口和与公用网和用户交换机电话中继线连接的特点。
美
