注意，函数只能作为不可变的序列访问这个列表—也就是说，尝试修改列表的内容会导致错误。

Note that the function can only access the list as an immutable sequence-that is, trying to modify the contents of the list results in an error.

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在访问内部对象之前对内核代码进行修改，以调用一个代表实施函数的钩子，该实施函数实现安全策略。

Kernel code is modified prior to accessing internal objects to invoke a hook that represents an enforcement function, which implements the security policy.

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如果在函数或类定义之外声明变量或常数，则是全局变量，它的值可在整个程序中访问和修改。

If you declare a variable or constant outside a function or class definition, it is a global variable, and its value is accessible and modifiable throughout your program.

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如果在函数或类定义之外声明变量或常数，则是全局变量，它的值可在整个程序中访问和修改。

If you declare a variable or constant outside a function or class definition, it is a global variable, and its value is accessible and modifiable throughout your program.

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