... Key Term and Concepts（主要概念和专用名词） Definitions（主要概念定义） Examples and Explanations（实例解释） ...
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主要概念是可嵌套定义分解结构的活动。
The main concept is the activity that can be nested to define breakdown structures.
特别是 RUP 将方法元素定义为关键概念，而主要的是“角色”、“工作产品”和“任务”。
Specifically, RUP defines the method elements as key concepts, and the main ones being "role," "work product," and "task."
概念数据模型定义主要的业务实体、这些实体的泛化（generalization）以及实体之间的关系。
The conceptual data model defines the major business entities, generalizations of those entities, and relationships between the entities.
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