说明：  Birch:这是一种综合的层次聚类的方法，它介绍了两个概念，聚类特征和聚类特征树，它们是用来表示聚类的。这些结构能够帮助聚类方法能运行得更快，能够处理大数据量。
(Birch: It is a comprehensive hierarchical clustering method, it introduces two concepts, clustering features and clustering feature tree, which is used to express clustering. These structures can help clustering method can run faster, can handle large volume of data.)