分析地震序列前期的时频度衰减曲线有可能区分出多震型地震，但快速区分间歇双震型和震群型地震较为困难。

By analyzing the early phase of frequency decay, it is possible to identify multi-shock earthquake sequence, but it is difficult to rapidly judge intermittent double-shock and swarm.

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由此划分出的类群称为自然类群。

The group which they delimit are called natural groups.

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通过这些信息，你可以区分出网站（产品）的主要用户群。

Using this information, you identify major user groups of your Web site.

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