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| 衍生元素 (An element, such as an attribute or association, that can be calculated or derived from other information. For example, an age attribute for the class Person can be derived if you know the Person's date of birth) | |||
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| 衍生元素 (An element, such as an attribute or association, that can be calculated or derived from other information. For example, an age attribute for the class Person can be derived if you know the Person's date of birth) | |||
