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关注：1
2013-05-23 12:21
求翻译：电路交换，PSTN网络，分组交换，IP电信网络是什么意思？ 待解决
 悬赏分：1
- 离问题结束还有
电路交换，PSTN网络，分组交换，IP电信网络
问题补充： |
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2013-05-23 12:21:38
Circuit-switched, the pstn network, packet switching, ip telecommunication networks
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2013-05-23 12:23:18
Circuit-switched, packet-switched network, PSTN IP telecommunications network.
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2013-05-23 12:24:58
Electric circuit exchange, PSTN network, grouping exchange, IP telecommunication network
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2013-05-23 12:26:38
Circuit switching, PSTN network, packet-switched, IP telecom network
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2013-05-23 12:28:18
circuit switched, packet-switched network, PSTN IP, telecommunications network;
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