但他也注意到，之前的网络技术在当时同样也引起了类似的担忧，例如新闻组，web技术和文件共享，这些每一个受带来了网络流量的大幅增加。

But he notes that similar worries arose with previous Internet technologies, such as newsgroups, the web and file-sharing, all of which involved big increases in the amount of network traffic.

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移动组播是移动互联网络技术的一个研究热点，但现有移动组播方案存在着组播中断时间长、协议开销大等问题。

Mobile multicast is a research hotspot of mobile network, but most of mobile multicast schemes suffer from the long multicast disruption time and heavy protocol cost.

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因此，研究组播覆盖网络技术有较高理论与现实意义。

So there is important significance in research on Multicast Overlay Network technology in the theory and the practice.

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