When categorizing, the documents in the search results are classified into several categories by a specific document property with a summary of each category provided.

分类时根据特定的文档属性将搜索结果中的文档分成几个类别，并且提供每个类别的摘要。

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A training sample needs to be pure text, extracted from a sample document of the category in question.

训练样本应该是纯文本，是从涉及的目录的样本文档中提取出来的。

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Documents are split based on whether the document has a category that matches one of the categories of interest.

分开文档的标准是它们的类似是否与某个感兴趣的类别相匹配。

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This conference is another important step initiated by the International Centre on Qanats and Historic Hydraulic Structures (ICQHS) - a category 2 centre under the auspices of UNESCO - to collect and document traditional knowledge available on water resources management from around the globe while providing a forum for presenting new views on the topic.

UNESCO: Water Portal | Water Events Worldwide