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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.这里，红椒又跑到正忙碌的鲁三白胖子等人身边吩咐道：从这一车开始数，往后五辆车里装的都是冻鸡和冻鱼。Successful investment is bound to be difficult, and it is even more difficult to obtain excess returns in the long run. It will treat all styles equally. However, different investment styles and strategies are difficult in different places. I sometimes think, what is the most pitiful but hopeless person? Ignorant and incompetent? Lazy? Stupid? In fact, they are not, but they do not know good or bad. Lack of intelligence can be made up by diligence, laziness and ignorance can be made up by noble help. If you don't know the good or bad, you will be in trouble. The person who originally hurt you will be regarded as a benefactor, but he will be regarded as an enemy when he is helping you. Is there any good in this life? The point is that there are really many such people in the stock market.讲述了朝鲜时代的一个贵族家庭因为被诬陷有谋反意图而家道中落，导致女儿必须女扮男装，外出夜行书生贩卖书籍，并与外貌优越的书生恋爱，卷入善恶两派吸血鬼战争的故事。The biggest difference between men and women when divorcing is that some men want company shares most, while women want custody of their children.Because ConcreteMediator controls centralization, it turns the complexity of the interaction into the complexity of the mediator, which makes the mediator more complex than any ConcreteCollage.