这是uml进行分析设计的一片文档，比较详细，-conducted an analysis of the design documents, in more detail,

This the UML diagrams for the buses managment system aim to analysis the strucure of the program -This is the UML diagrams for the buses managment system aim to analysis the strucure of the program

UML的pos机应用！其中包含POS机的类图，简洁明了-UML class pos