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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 Encyclopedia刑警田志平二十年前收养了他亲手逮捕的罪犯苇子的女儿小梅，并与小梅的母亲卜玉琴结婚。二十年过去了，从襁褓中长大的小梅丝毫不知田志平并非她的亲生父亲，一家人相亲恩爱。被判无期徒刑的苇子经过改造后立志重新做人，争取提前释放，待出狱后寻找一直深爱的妻子卜玉琴和女儿平安地过下半生。Stephen: English Christian name + Greek derived from the Middle Ages, meaning "crown", English surname, male first name, nicknames Steenie, Steve, Stevie.在一档有奖益智类节目中，出现了作弊者，究竟谁才是作弊者呢？探寻真相后发现事情并不简单。Erythrina Park is located on the northwest side of the intersection of Erythrina Road and Jinhuai Street in Fengze District of Quanzhou City. It is a district-level park for leisure and entertainment. It covers an area of 3.67 hectares. The project department invested 14 million yuan. Construction started in 1995 and was completed and put into use in 1997. The park is located in a suitable position and has convenient transportation. It is a good place to rest and play.故事讲述孤寡大半辈子的丁奶奶含辛茹苦拉扯大的两个独生子如龙、如虎都已过不惑之年。忠厚、善良又有些软弱的建筑工人如虎，为了老母和三个孩子，在妻子死后多年，依然孤身一人照顾全家。