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你杀……一个郑姑娘，还会有第二个、第三个……天下女人……你杀得完吗？如此牵累无辜，不是贤臣所为。"Yes, it's the kind of big rats. They are more difficult to deal with than big wasps. Especially when these two things go together, one is in the sky and the other is underground. We should be too busy to take care of them. Moreover, the kind of big rats have very strong teeth. It's a piece of cake to bite off their arms and legs in three or two, and they move very quickly." Zhang Xiaobo said.陈启和魏明林又说了一些闲话后，便告辞离开了。Wrestling范文轲的一句话，无疑是伤口上撒了一把盐，深深地刺激到了范文轩本来已经有些脆弱的心。生长在奇葩家庭的所谓“坏孩子”王恕拥有着强大的正义感，可他在学校还是被称为坏孩子。王恕偏偏喜欢上当之无愧的“好孩子”马秀，懵懵懂懂又哭笑不得的青春爱情发生着。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.