The modeler can add new attributes to an existing class.

建模师可以向现有类添加新属性。

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Replace the existing class definition with the following.

用以下代码替换现有的类定义。

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If the class has already been loaded, you'll get back the existing class information.

如果已经装入了类，您将得到现有的Class信息。

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If the class has already been loaded, you'll get back the existing class information.

如果已经装入了类，您将得到现有的Class信息。

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