Use cases only document behavioral requirements.
用例只记载行为需求。
An essential use case model, often referred to as a business or abstract use case model, models a technology-independent view of your behavioral requirements.
基本用例模型，通常称为商业或抽象用例模型，对行为需求的与技术无关的视图建模。
An important goal in requirements modeling is to come to an understanding of the business problem that your system is to address, in order to understand its behavioral requirements.
需求建模中的重要目的是要理解系统将处理的业务问题，以理解它的行为需求。
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