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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.慌乱之中，海舍火光泛起，好似被炸到一般，整个海舍瞬间被点燃，阵阵黑黄的浓烟滚滚升起，杨长帆一直以来的努力被付之一炬。午夜，熊熊大火正吞噬著一棟民宅，程佑寬身陷火海之中，但他知道屋子裡面還有人！他一邊嗆咳著，一邊拼命尋找，終於看見一個被束縛住手腳，哭喊救援的女子，當程佑寬正要伸手救援時，一陣熟悉的心痛感襲來，讓他驚醒！ 原來，這是佑寬的夢境，他可以預先夢見將死之人，但卻無法出手援救，因為每當他想要救人時，他的眼中就會長出妖豔的彼岸花，一路蔓生到心臟，揪心之痛讓他無法再前進一步！於是，佑寬就算夢見了，知道了，也只能眼睜睜看著人們在他面前死去，十九年來每一天，每一晚都是如此，這就是他的宿命，他的詛咒…… 當年十歲的佑寬因為被同學欺負，將自己被霸凌的原因，全都歸咎於害他被人誤會是小偷的同校同學-畢克葳，於是當他生病高燒命危時，他心有不甘的向看不見的力量許願，願望的內容就是，希望克葳代替自己承受劫難…… 從今以後，佑寬、克葳彼此覆蓋的命運，到底有誰能活下去？说不上三句话，板栗和葫芦就得知：郑家和赵家从南华门进城后，在德胜路被一个人蓄意冲撞，惊了马，翻了一辆人坐马车，郑长河和赵三从车上跌了下来，还翻了三辆货车。　　母亲为了证明自己是1949年9月30日入伍，而非后来为了喜庆而改成的10月1日，到处奔走，寻找当年日暮时分，绵绵秋雨下将起来。