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Visitor mode is to encapsulate some operations applied to a certain data structure. Once these operations need to be modified, the data structure that accepts this operation can be saved unchanged. Visitor mode is suitable for systems with relatively stable data structures. It reduces the coupling degree between data structures and operations acting on data structures, making the set of operations relatively free to change. The specific structure diagram is as follows:随着技术的进一步发展，所有的军事组织都采用了手持与人偶相配的枪的“战术人偶”。(The View here is the smallest child view in the interface diagram, not ViewGroup1 or ViewGroup2)Procurement units (government agencies), personal certificates:Users' needs in content consumption can be roughly divided into four categories: reading information, learning knowledge, consumption decisions and time consumption.就这样，第二日天蒙蒙亮，板栗便轻装简从，只带魏铁和几个护卫，直奔云天寺去了。