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-The software interface has been redesigned and improved;"When this thing first appeared (that kind of dog-like 'living biological weapon'), I thought it was the gunfire that frightened the wild animals in the nearby woods. However, when I thought about it later, I was not right. Although I don't have a high diploma, The highest education received is high school. But before going to the front, In order to better adapt us to the fighting and life in Vietnam, Every backbone and cadre from the vice squad leader to the battalion level has gone through half a month to a month of 'surprise study'. The main content of the study is to catch up on the knowledge related to Vietnam. Among them, it is related to the local tropical rain forest, And what biological part of it takes up at least half of the class hours, What leeches, leeches, all kinds of poisonous snakes and insects, All said, but did not mention that there are social carnivores here, and they will also take the initiative to attack human beings so fiercely. I think if there are, it is impossible not to write in the textbook of "surprise learning", then it is not a natural creature. I was wondering at that time, when they appeared just at the time when the Vietnamese army's attack was frustrated, would it be related to them?只要没有被周徐两家抢在前面，总是好的，倚仗人数优势，找到人只是时间问题。两名倒霉的电视技术员无意间撞见谋杀现场。为了避免成为嫌疑犯，二人采取了行动，结果每一步都弄巧成拙。“笨吉”原本是一只吃百家饭的流浪狗。它最喜欢一对兄妹，因为他俩经常瞒着妈妈悄悄陪它玩耍，喂它美食。某天，这对兄妹被坏人绑架。在妈妈和警方都惶恐不安而又无所适从之时，聪明勇敢的“神探狗”笨吉克服险阻，用自己的方式救出了这对兄妹，也找到了梦寐以求的家。笨吉的故事提醒我们，身边的宠物或许就是拯救人类的英雄。…,李斯，尉缭。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: