In change mining phase the approach firstly excavate rules between two different time periods, comparing them to determine the trend changes.
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.
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。
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