为了可用性需要由最终用户选择向他们显示的表示元素、属性和枚举值的单词，并且甚至可能需要为说英语的人员翻译这些单词。

The words displayed to end users for elements, attributes, and enumerated values need to be chosen for usability by end users and will probably need to be translated even for English speakers.

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本文仅关注类图以及相关联的模型元素（类、包、关联、属性和枚举）。

This article will only focus on the class diagram and associated model elements (class, package, associations, attributes, and enumeration).

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“图书”这个类拥有一项枚举类型的属性。

The Book class has an attribute whose type is that of an enumeration.

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