该方法包括三个步骤，分别是专利收集，专利指标的计算，和变化挖掘。
The proposed approach consists of steps including patent collection, patent indicator calculation, and change mining.
变化挖掘方法是通过建立专利规则，比较两个不同时期的专利并确定其变化趋势。
In change mining phase the approach firstly excavate rules between two different time periods, comparing them to determine the trend changes.
从挖掘物中获取的浮选样本让植物学家能够研究植物采集习性的转变，就好像是用望远镜观察不断变化的景致。
The flotation samples from the excavations allowed botanists to study shifts in plant-collecting habits as if they were looking through a telescope at a changing landscape.
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