定义项目组的组织，角色和职责要求。
Define the project team's organizations, roles and responsibility requirements.
定义要求长期使用和短期使用的构件。
Define components requiring long life and those for which a short life is required.
定义要求长期使用和短期使用的构件。
Define components requiring long life and those for which a short life is required.
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