After this, you define several constants for your stack frames.

之后，为堆栈框架定义几个常量。

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All the stack frames are allocated in a region of memory called the call stack.

所有栈帧被分配在称为调用栈的内存区域。

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All the stack frames are allocated in a region of memory called the call stack.

所有栈帧被分配在称为调用栈的内存区域。

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