可以设置时间间隔，小到两分钟，大到整个数据集。

The time interval can be set from a little as two minutes to up to the whole data set.

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它可以迅速地将整个数据集分成组，供您快速得出结论。

It can quickly take your entire set of data and turn it into groups, from which you can quickly make some conclusions.

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因此第一项任务是构建一个表示整个数据集的XML文档。

So the first task was to build an XML document that represented the whole data set.

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