记住当程序进行函数调用（特别是针对递归函数）时，它必须在堆栈上存储返回地址和本地变量。

Remember that when a program makes a function call (especially for recursive ones), it has to store its return address and local variables on the stack.

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非递归查询允许服务器返回部分响应，例如返回可能知道答案(或可能具有更多信息)的服务器的名称或地址。

Non-recursive queries allow the server to return a partial response, such as returning the name or address of the server that may know the answer (or may have more information).

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通常，非递归算法要保存返回地址，使程序能继续正确执行。

Usually, return address must be saved for continuing a right execution of the program in no recursion version.

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