说明：  在这个项目中，你将分析一个数据集的内在结构，这个数据集包含很多客户真对不同类型产品的年度采购额（用金额表示）。这个项目的任务之一是如何最好地描述一个批发商不同种类顾客之间的差异。这样做将能够使得批发商能够更好的组织他们的物流服务以满足每个客户的需求。
(In this project, you will analyze the internal structure of a data set that contains annual purchases (expressed in amounts) of different types of products for many customers. One of the tasks of this project is how to best describe the differences between different types of customers of a wholesaler. This will enable wholesalers to better organize their logistics services to meet the needs of each customer.)