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EXAMPLE 4　　故事围绕Martha Mitchell展开。Martha惹人注目、口无遮拦，是阿肯色州的社交名流，也是尼克松忠诚的司法部长John Mitchell的妻子。尽管她有党派背景，却是第一个公开就尼克松参与水门事件发出警告的人，这导致了总统任期的崩塌，和她的个人生活的破裂。作为司法部长，Mitchell是尼克松最信任的顾问和最好的朋友。他脾气暴躁、出口成脏、冷酷无情，但也无可救药地爱着自己以直言不讳而闻名的妻子。Mitchell将被迫在Martha和总统之间做出选择。记录片讲述了穆罕默德·恩瓦齐从一个普通的伦敦男孩成长为恐怖分子“圣战约翰”和情报人员试图抓住他的内幕。王素敏独自抚养两个女儿刘小敏、刘小捷长大，没想到女儿们年过三十却先后离婚。大女儿刘小敏因丈夫出轨，从小地方来到北京打拼，她和同样离过婚的陈卓相识相知。但小敏和陈卓都有着不省心的前任、青春期的孩子和年过花甲的老人，如何获得对方家人的认可，融入彼此的生活，成为两人 不易克服的难关。二女儿刘小捷一婚时糊里糊涂，因性格不合与丈夫离婚，本不想再婚却遇到青年才俊徐正，被男方认真追求，但徐正比小捷年龄小，也还没结过婚，两人的恋爱受到徐正父母的强烈反对。刘小敏和刘小捷在母亲的教导下，用爱和宽容解决感情里的难题，最终都找到了人生的幸福，收获了成长。周芷若发现，一切都变了，张无忌离她越来越远，她开始不知所措。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.2. People: There must be the participation of several types of people: the attention and attention of superior leaders, the beating about the bush of safety experts, the focus of safety operation and maintenance engineers, and finally the assistance of application, system, business, network, monitoring, OA and other areas.