Essential models are more robust than concrete representations simply because they are more likely to remain valid in the face of changing requirements and changing implementation technology.

基本模型比具体表示法更加强健，这是因为在需要更改需求和更改实现技术时，它们更易保持有效。

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MDA practitioners recognize that transformations can be applied to abstract descriptions of aspects of a system to add detail, make the description more concrete, or convert between representations.

MDA 的从业者认可转换能够被应用到一个系统的各个方面的抽象描述以添加细节，使描述更加准确，或者在表示法之间进行转换。

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In a resource oriented system requests are made for resources and concrete, immutable resource representations are returned.

在面向资源的系统中，我们对资源发出请求，然后系统将具体的、不变的资源表示返回给我们。

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