It implements the elements in the design model by writing source code, adapting existing source code, compiling, linking, and performing unit tests.

它通过编写源代码，采用已有源代码，编译，链接以及执行单元测试，实现设计模型中的元素。

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The RentalLocation has to obtain this existing information from our on-line Reservation RDBMS, and in Step 6 I have added a new design class, DataAccess, that implements the Façade pattern.

RentalLocation必须从在线的预约RDBMS获得这些已有信息，在第6步我加入一个新的设计类DataAccess，来实现Facade模式。

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Model-view-controller: The Rails MVC framework — called Action Pack — is customized for Web-based access and implements a well-known design strategy called Model 2 (see Resources).

模型-视图-控制器：Rails的MVC框架(称为Action Pack)为基于Web的访问进行了定制并且实现了著名的被称为Model 2(参见参考资料)的设计策略。

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