1. 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. 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。
2. Metals are also large aggregations. 金属也是一个大的集合。
3. Alignment here will identify which fields require aggregations. 而这里的校准将标识出哪些字段需要聚合。
4. This is also true if the aggregations are of a different nature. 如果聚合具有不同的属性，这也成立。
5. Note that a single SQL statement can contain multiple aggregations. 注意，一条sql语句中可以包含多个聚集。
