地震活动的主要特点表现为时间上的成丛性、空间上的迁移性及丛内迁移的有序性；
The main features are the clustering in time, the migrating in space and the orderliness in migratory route.
多通道数据采集系统中获得的数据在时间上具有明显的有序性，充分利用这种有序性可以大大提高查找算法的效率。
The data of multi-channel data acquisition system have ordering in time obviously, full advantage of this ordering can greatly improve the efficiency of search.
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