历史这个概念是用栈来实现的。

History concept is implemented as a stack.

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分析递归算法的栈实现以及用栈运算转换递归算法为非递归算法，阐述递归思想及其应用。

The realizing recursive algorithm by stack and the Changing recursive algorithm into non-recursive by stack operation are studied. The thinking of recursion and its application are expounded.

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