大部分都包含一个恒星类型或列有恒星相关信息的目录的简称，之后是一组标号。
Most consist of an abbreviation that stands for either the type of star or a catalog that lists information about the star, followed by a group of symbols.
聚类是通过相似度对没有类别标号的数据集中数据进行分组，使得组内对象相似度高而组间相似度低。
Clustering group the absence category labels data by similarity degree, there are high similarity inner group and low similarity between groups.
聚类是通过相似度对没有类别标号的数据集中数据进行分组，使得组内对象相似度高而组间相似度低。
Clustering group the absence category labels data by similarity degree, there are high similarity inner group and low similarity between groups.
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