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尹旭笑道道：粮草沿河而建，怕的就是失火，救援起来方便。Visitor pattern decouples the data structure from the operations acting on the structure, making the operation set relatively free to evolve. Visitor pattern is suitable for systems with relatively stable data structure and easy change of algorithm. Because visitor mode makes it easy to increase algorithm operation. If system data structure objects are easy to change and new data objects are often added, visitor mode is not suitable. The advantage of visitor mode is that it is easy to add operations, because adding operations means adding new visitors. Visitor mode centralizes the relevant behaviors into one visitor object, and its changes do not affect the system data structure. Its disadvantage is that it is difficult to add new data structures. -From EncyclopediaAnd what Wang Zeduan said about him, Liu Guangyuan, who provided oral memories earlier, He was the only survivor of the four soldiers who had rebuilt the minefield at that time. In the memory just now, He has been blaming himself for running back alone as the first-line witness of that year but failing to save his comrades. At that point, I choked up several times and couldn't speak, and asked that I didn't want to think more about the events of that year. I respected his request, so I didn't urge him to ask, and I didn't record the information about this period of history from Liu Guangyuan's perspective. It was still regrettable from my heart, but fortunately, Wang Zeduan's memory filled the gap to a large extent.Source: Picking Up (ID: Shiyi201633)Whether the fire extinguisher is in normal condition.本片围绕时尚品牌古琦（Gucci）的第三代接班人毛里奇奥·古琦（Maurizio Gucci）的故事展开，毛里奇奥是古琦创建人古琦欧·古琦（Guccio Gucci）的孙子，1995年被一个西西里岛的年轻人枪杀于米兰办公室的楼梯上，他的妻子Patrizia Gucci因策划杀夫一案而被判入狱29年。There are unclear questions at the MDT meeting, which can be asked to be clarified by the other party or oneself.