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　　建平（汪明荃饰）、孝礼（秦沛饰）及景良（郭峰饰），这段三角恋情辗转一生，各人最后的感情依归，却令人竟意想不到…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 EncyclopediaThe mountains are high. Where are the expressways?面前分明就是一个中原的读书的儒者，气质很是儒雅，装扮和衣着也都是中原人的打扮，这倒是在尹旭的意外之外。A make more components when modeling, so if there is a problem, only one component will be modified, and the rest of the copied components will be automatically modified in association, mainly for multiple copied windows, doors and the like.1. Final integralEpisode 17