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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:七个小矮人的木屋闯来一位迷路的小女孩汉娜，她坚信失踪的爸爸还活着，所以仅凭一支神鸟羽毛线索四处寻找爸爸。白雪公主和小矮人被她感动决定要帮助她，于是她们驾驶热气球飞向鸟岛，途中遭遇巨鹰和风暴袭击，险象环生。掉下森林后又经历了魔法屋的重重考验，她们历经千辛万苦见到神鸟，知道了爸爸失踪原因跟王后最近得到的一件世界上最美丽的礼服有关。随后救人路上她们落入王后的圈套全部被抓，危机关头，王子赶来同白雪公主和小矮人一起帮助解救爸爸，最后父女团圆。Now consider the drawbacks of the above procedure先暴喝一声好，然后扫视面前众人，如同在战场上一般，睥睨四方，这才是我张板栗的妻子：上得厅堂，下得厨房，入过男人学堂——周夫子被孙女婿的话给惊了，噗一声喷出嘴里的茶——岂是寻常女子可比。(3) If the length exceeds 100m, add a number of ring-illuminated white lights between the lights specified in items (1) and (2) so that the distance between these lights does not exceed 100m;太阳突然开始杀死它照耀的一切,从布鲁塞尔起飞的一个夜间航班上的乘客竭力求生。　　【以上内容为匿名字幕组翻译自Radio Times原文，转载请注明出处】