有些情况下您可能需要确保基底类别方法没有被覆写。
In some situations, you may need to ensure that base-class methods are not overridden.
例如,您可能会扩充一个类别以变更基底类别方法的行为。
For example, you may extend a class to change the behavior of the base-class methods.
在版本安全模式中执行时,每当基底类别方法被覆写时,都必须使用其中一个版本安全修饰词。
When running in version-safe mode, one of the version-safe modifiers must be used whenever a base-class method is overridden.
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