中文说明：快递以下 z-变换分解适当形式、 绘制其两极和零然后确定它是所有可能 ROCs 并解释该特定功能针对每一个这些 ROCs 定制
English Description：
The following Z-transform decomposes the appropriate form, draws its poles and zeros, then determines that it is all possible rocs and explains that the specific function is customized for each of these rocs