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First drag mod into this windowVisitor 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:Grape variety1. Develop an event response processSelect Preferences, enter the Language drop-down menu of the General tab, and select Chinese Simplified to switch to the Simplified Chinese interface再有，尹旭等人在附近一带名声极好，对乡民施恩不少。　　高中的时候，和很多男生一样拥有自己的梦中情人，但是因为肥胖让高满秀深感自卑，高考落榜后，又遭到未婚妻吴水晶的抛弃，接连受到打击。后来他隐姓埋名，努力减肥，8年后，变身成为成功的高尔夫选手，由丑小鸭摇身一变成为万人迷，开始对吴水晶展开“复仇”，孰料反倒被吴水晶穷追不舍。当年被...