在面向对象的分析和设计方法中，系统接口通常被视为契约。

In Object Oriented Analysis and Design Methodology, a system interface is most often viewed as a contract.

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UML是一种经过试验和测试的用于面向对象系统的建模工具，作为设计XML模式的一种媒介，它对开发人员、业务分析人员和供应商都极具吸引力。

UML is a tried and tested modeling tool for object-oriented systems, and it is attractive for developers, business analysts, and vendors as a medium for designing XML schemas.

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由于我们是在设计一个面向对象的软件系统，我们的用例行为需要由我们系统中的一些对象和类来执行。

Since we are doing an object-oriented software system, the behavior of our use case must be carried out by the classes and objects in our system.

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