一切都不会变老，凋零或消失。 但同样地，一切都不会诞生，创造或更新。
Nothing would age, wither or disappear but by the same token, nothing would be born, created or renewed.
大多数UML模型API仅仅提供了最基础的模型访问功能(获取、创造及更新模型单元或属性)。
Most UML model APIs provide only the most basic model access functionality (get, create, and update model elements and properties).
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