考虑到住在集群式城镇的种种弊端，为什么13世纪的人们会搬到这些拥挤的地方呢？
Given all the disadvantages of living in aggregated towns, why did people in the thirteenth century move into these closely packed quarters?
随着小冰河期发展，农民可能把田地移到了海拔较低的地方，侵占其他农民的土地，把人们挤在一起，从而形成了集群式的社会。
As the Little Ice Age progressed, farmers probably moved their fields to lower elevations, infringing on the lands of other farmers and pushing people together, thus contributing to the aggregations.
固定的节点层级：这一特性支持确定集群领导、自动合并组以及在多点传送不工作的地方发现节点。
Fixed node Hierarchy: This feature supports the ability to determine cluster leadership, auto merge groups, and node discovery where multicast might not work.
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