如果可以信任类、程序集或派生类，则限制它们的可访问性的范围。

Limit the scope of accessibility to the class, assembly, or derived classes, if they can be trusted.

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指定一个或多个已声明的编程元素只能从其自身的类或派生类访问。

Specifies that one or more declared programming elements are accessible only from within their own class or from a derived class.

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名字被嵌套的声明区域或派生类(10.2)中相同名字的显式声明所隐藏。

A name can be hidden by an explicit declaration of that same name in a nested declarative region or derived class (10.2).

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