随着网络规模不断扩大，子网数量急剧增多，目前全局最优的传统路由算法将面临严重挑战。
As the networks are expanding and sharp increasing in the number of sub-network case, the current global optimal routing algorithms face serious challenges.
虽然主门户网站最多可以容纳2,000个子网站，但是在子网站数量增加时系统可能出现性能问题。
Although the main portal site can hold up to 2,000 subsites, your system might have performance problems as the number of subsites increases.
当自组网网络节点数量达到一定规模时，需要对网络进行分级管理，划分出多个子网。
When the node number in MANETs reaches certain amount, then the MANETs need to hierarchical management and the whole MANETs is divided into several subnets.
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