它必须足够大以适应所有用户的内存映像复制份数，并且他必须提供直的通路以适应这些内存映像。
It must be large enough to accommodate copies of all memory images for all users, and it must provide direct access to these memory images.
你复制的份数够吗？
组播技术采用群组发送的方式，用路由器来复制数据包，保证任何时候每条链路中只有一份数据包，因此节约了网络带宽。
Multicast technology applies the method of group transmissions, using Router to copy data packages, it promised only one data package in every link at any time, and saved bandwidth.
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