2、归类及排序(clustering and ordering) 经由前一步骤所选出的概念词，分析其属性，然后把属性相似者归于同一丛集(cluster)，属性不相似的就分开归类。
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If a table scan is used, the clustering would not really be beneficial because DB2 still has to read all rows and then the physical ordering is not very important.
如果使用表扫描，那么聚集就不会真正有益，因为DB 2仍然必须读取所有的行，那么物理排序不很重要了。
Computer simulation was firstly performed on the precipitation mechanism at mean-field spinodal lines in complicated system with ordering and clustering.
首次对既存在有序化又存在原子簇聚的复杂体系中平均场失稳线上合金的沉淀机制进行计算机模拟。
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