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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.电视剧围绕着恶名远昭的贩毒集团和追踪集团的警察的卧底计划而展开，讲述了冷血毒枭郑时贤、誓瓦解贩毒集团警察池亨民与潜入贩毒集团和郑时贤、池亨民命运邂逅的尹秀敏之间残忍的爱情以及苦难的故事。Start the computer!女硕士吴芳不停地相亲，每次和男人约会她都要点一杯绿茶，她相信一个叫朗朗的女孩说的话，从一杯茶预测一个人的爱情。陈明亮觉得这都是女孩子的胡说八道，他认为女人不外乎就两类：森林型和罗马型。在森林里，你看见有无数条路、无数种可能，所以在森林型女人面前，男人容易迷路；而在罗马型女人面前，男人容易迷失自己，因为你永远不知道在另外的路上，正有多少人向着同一个目标进发。该剧讲述刑警和刑警的恋人，以及杀人魔，这三个人32年前因为恶缘结束了生命，但死并不是终点，而是打开了新的大门。32年后他们分别转世成检察官、考古学讲师、医学院学生，因为强烈的缘分和恶缘再次纠葛在一起。《天线宝宝》有两个元素：一个是“幻想园地”、一个是“真实纪录”。“幻想园地”是指《天线宝宝》的主要场景“神奇岛”，岛上有许多幻想奇观，让孩子有创造力、想像力；四个天线宝宝在神奇岛上玩乐，彼此之间有良好的关系，没有暴力，虽然很多事情都不懂，但是很喜欢学习。天线宝宝们是科技的产物，是幻想的人物，不等同于人类，所以不一定要有父母、兄弟姊妹等人类关系。我们的重点是吸引情侣的乔治（拉菲·斯帕尔）和艾米（埃莉诺·汤姆林森）。 《伦敦晚报》记者和业余科学家刚抵达沃金，希望他们的新环境能帮助他们找到和平。乔治决定与表弟露西为受过教育的艾米离开无爱的婚姻，这使他被礼貌的社会所规避，与家人疏远了。甚至他的前亲兄弟弗雷德里克（Rupert Graves），政府官员，现在也没有时间同胞。他嘶嘶地说：“这是一种自私，残酷的追求，不能不带来最不愉快的后果。”