downward closed
... 停机时间比 downtime ratio 向下闭合 downward closed 向下相容性 downward compatibility ...
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基于向下闭合引理，对时空频繁状态表中的对象进行时空拓扑匹配，得到时空关联规则候选集；
Matching objects in the item set based on downward closure lemma and spatiotemporal topology: we match the objects in order to create the spatiotemporal association candidate set;
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