用以下代码替换现有的类定义。

Replace the existing class definition with the following.

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categories允许您以一种受控的方式改变现有的类。

Categories allow you to make changes to existing classes in a controlled way.

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相反，可以将模块附加到任何现有的ruby类。

Instead, you can attach modules to any existing Ruby class.

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如果已经装入了类，您将得到现有的Class信息。

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

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现有的应急领域知识模型大致分为两类。

Presented knowledge model in the field of emergency can be divided into two categories.

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现有的应急领域知识模型大致分为两类。

Presented knowledge model in the field of emergency can be divided into two categories.

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