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This mode applies to scenarios: If we want to add new functions to an existing class, we have to consider several things: 1. Will the new functions have compatibility problems with the existing functions? 2. Will it need to be added later? 3. What if the class does not allow code modification? Facing these problems, the best solution is to use visitor mode, which is suitable for systems with relatively stable data structure, decoupling data structure and algorithm,So-called peripheral functions, such as performance statistics, logging, transaction management, etc.当时局势未明，魏豹夹在楚汉之间想要有所谋求，以至于有所延缓。The victim's neck was pressed and she shouted, "You are strangling me." She kicked and bit the beam with her mouth. The beam still refused to let go and strangled her.After the MDT meeting, MDT diagnosis and treatment suggestions should be communicated and communicated with patients and their medical teams in a timely manner (on the same day or the next day);你就糊弄吧。在下于汉王曾经有一面之缘，汉王认得在下，子房先生也就可以疑窦尽去了。