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1. In the process of movement and change of things, some features appear repeatedly many times, and the time taken for them to appear twice in a row is called "cycle". Periods are divided into mathematical cycles, chemical cycles, physical cycles, biological cycles, economic cycles and other types.《9号秘事》是由吉列尔莫·莫拉莱斯担任导演，《绅士联盟》成员史蒂夫·佩姆伯顿和里斯·谢尔史密斯自编自演，联合BBC推出的一部英国暗黑喜剧。该剧与《黑镜》结构类似，一集一个故事，每集故事都是独立的，第二季于2015年3月26日首播，一共由六个新故事组成。说的是，孩子与狗狗爆米花之间的故事。动画主要讲述的是王志哲是电脑权威王博士之子。一天晚上，他和老爸誓要“爆机”，而妈妈如往常一样对这这对无所事事的父子大发雷霆。这时，王博士大学时的好友达克浑身是血登门拜访。正在全家人诧异时，闯进来一只紫色狼人！达克也化身成蓝色狼人，并打败了紫色狼人。　　问题少年瑞恩（本杰明·麦肯锡 Ben McKenzie 饰）在贫民区长大，一日在哥哥教他偷车的时候，被警察抓住。公设辩护队律师桑迪·科恩成了他的监护人。因负责监管瑞恩的生活桑迪让他住进了自己位于纽 波特海滨的家中。桑迪的妻子凯斯顿对瑞恩的到来并不欢迎。她担心瑞恩会对自己年少的儿子塞斯（亚当·布罗迪 Adam Brody 饰）产生不良影响，只同意让瑞恩住一周。在与科恩家相处的第一个晚上，瑞恩遇见了科恩家隔壁的女孩玛丽莎（米莎·巴顿 Mischa Barton 饰），并对她一见钟情。In real life, China's income tax is divided into enterprise income tax, foreign-invested enterprises or foreign-invested enterprises income tax and personal income tax. For these three types of income tax, each is calculated in a different way. Personal income tax has a personal income tax calculation method, while enterprise income tax has its corresponding calculation method. If we do not adopt the policy mode to realize such a requirement, we will define an income tax class, which has an attribute to identify the type of income tax and a CalculateTax () method to calculate the tax. In this method, we need to judge the tax type and calculate the income tax for different tax types through if-else statements. Such an implementation can indeed solve this scenario, but such a design is not conducive to expansion. If the system needs to add an income tax in the later period, it has to go back and modify the CalculateTax method to add an additional judgment statement, which clearly violates the principle of "open-closed". At this time, we can consider using the strategic mode to solve this problem. Since the tax method is the changing part of this scenario, we can naturally think of abstracting the tax method at this time, which is also the essence of the implementation of the strategic mode.