UML的整体应该分为业务建模和系统建模，前者更倾向于对业务过程的描述和功能的梳理，而后者更倾向于系统设计，指导开发。-UML as a whole should be divided into business modeling and system modeling, the former was more inclined to describe the business processes and functions of the comb, while the latter is more inclined to system design and guide the development.