The descriptions describe the functionality of the use case in the system; the diagram provides the visual roadmap of those descriptions.
这些描述描述了系统中该用例的功能性；这张图表提供了这些描述的可视化路标。
Use case diagram Provides a behavioral view of system context by displaying actors external to the system who go to the system to achieve a specific, valued result (use case).
用例图通过向即将使用系统的人员提供一个系统背景的行为性视图，来取得一个特定有价值的结果(用例)。
Being able to begin your software development efforts by outlining system behaviour via a use case diagram really helps you create a quality application architecture and design.
可以通过用例，略述系统行为就可以开展软件开发，并帮你创建高质量的应用程序体系结构与设计。
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