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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./raise (raise your hand)影片由德鲁·皮尔斯执导，朱迪·福斯特主演，戴夫·巴蒂斯塔、索菲亚·波多拉出演。在近未来洛杉矶一家专门为罪犯疗伤的医院，福斯特饰演的护士在工作中偶然发现一名举止怪异的病人，与此同时其他病患却接连死于非命她会让人有机会盯着看吗？当然不会。这部BBC伪纪录片式喜剧讲述了BBC为深入了解如今在英国农村地区的年轻人感到的前所未有边缘化，在科兹沃尔德地区村庄跟拍了一些年轻人。这是Charlie Cooper和Daisy May Cooper姐弟俩根据自身经历自编自演的伪纪录片式喜剧，他们名不见经传，不久前还无业住在父母家，浑浑噩噩一事无成，以此经历改编的故事却成了这部热门BBC喜剧。When faced with large-scale attacks, it is even more important to resist attacks from the upstream.