由于技术和经济方面的原因，直到现在，全网范围内的IP组播服务尚未完全部署。
Because of some technology and economy issues, IP multicast service among the whole network haven't been deployed completely.
由于技术和经济方面的原因，直到现在，全网范围内的IP组播服务尚未完全部署。
Because of some technology and economy issues, IP multicast service among the whole network haven't been deployed completely.
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