By modeling use-case, UML can describe the external roles that are interested in system and the requirement of function of system.
通过用例建模，描述对系统感兴趣的外部角色及其对系统的功能要求。
By modeling use-case, UML can describe the external roles that are interested in system and the requirement of function of system.
通过用例建模，描述对系统感兴趣的外部角色及其对系统的功能要求。
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