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Let's first analyze the above process. We can summarize as follows: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.故事从锦衣卫大明东厂挖掘古墓开始，大明东厂专权的年代是大明王朝最黑暗的年代，此时民不聊生，社会动荡不安，种种危机并存……无忧公主，出身贵胄，父亲为当朝皇叔，母亲乃江南大家闺秀，未受尘事沾染，是冰清玉洁的纯真少女。祥和、平静、幸福的生长环境造就了她天真无邪的特性，然而随着古墓的挖掘，引起了巨大家变——千年古墓埋葬着很多故事，也隐藏着很多诅咒，古墓的开启也就是诅咒的爆发……父亲鄱阳王被东厂陷害，无忧公主与母亲弟弟流落江湖，被东厂不停追杀，家恨国仇的重担突然落到了她的身上。一代大侠海无颜在救了无忧公主的同时，也成了无忧公主的梦中情人，而海无颜却另有所爱，只是海无颜的爱更象是一个梦，一个已经渐渐远离的梦，她必须在最短的时间内，快速地成长起来。无忧公主没有让人失望，成为了一代英雄……"Secret" cover. "Xunzi, Fei Twelve Sons": "It is very uncommon and has no class, hidden and no, closed and no solution." Han Cai Yong's "Shu Xing Fu": "I think of Mi Fei's flashes, but God is hidden and hidden." Ye Shengtao's "A Young Man": "This time we must spit out a subtle and hidden mood, express it truthfully, and do not change a little." 2. Refers to a place of concealment. "Han Feizi Six Anti-Japanese": "Fu Chen's light goods are secluded, although his history is suspicious. In a city of hundreds of gold, although the thieves will not take them." 3. Seclusion; Hidden. Han Yan taboo "mourning life": "seclusion is a distant disaster, which can be done." In the Book of Rites, Biao Ji, Tang Kongying Da Shu said, "Although the gentleman's body is hidden and hidden, his morality is hidden and his reputation is remarkable, so the cloud is hidden and obvious." 4. Refers to people who live in seclusion. "Biography of Lang Yi in the Later Han Dynasty": "Changing Yuan Dynasty to a new beginning, seeking seclusion,杨长帆道出的退路很简单，上岸一个，出海一个，想要船主上岸，先要送来船主的亲子上船。