Sealed classes prevent derivation.
密封类禁止派生。
Actually trying to understand why sealed classes even exist.
真的想了解为什么密封类即使存在。
It includes things like runtime typing, sealed classes, packages, namespaces, and an overhauled event model.
它包括了很多东西，比如运行时类型检测，封装类，包，命名空间，以及一个全新改版的事件模型。
By default, most classes should not be sealed.
默认情况下，大多数类都不应是密封的。
Do declare static classes as sealed and abstract, and add a private instance constructor, if your programming language does not have built-in support for static classes.
如果编程语言没有对静态类的内置支持，则应将静态类声明为密封的和抽象的，并添加一个私有实例构造函数。
Static classes are sealed and therefore cannot be inherited.
静态类别是密封的，因此无法继承。
Ensure that all derived classes implement similar protection or are sealed.
确保所有派生的类实现类似的保护或被密封。
Ensure that all derived classes implement similar protection or are sealed.
确保所有派生的类实现类似的保护或被密封。
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