pstn
abbr. 公用开关电话网络（Public Switched Telephone Network）
public switched telephone network,公共交换电话网络
distinctively fleetness telemetry tingle utterance
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abbr. 公用开关电话网络（Public Switched Telephone Network）
public switched telephone network,公共交换电话网络
distinctively fleetness telemetry tingle utterance