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可多少都是我们做长辈的心意，你们再嫌弃，我们也要给锦鲤个交代。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.农村寡妇赵小芸（马伊俐 饰）孩子哮喘病发，乡亲们凑了一万多块钱，连夜开着拖拉机带着他们到扬州看病。半路上，拖拉机坏掉，遇到好心的的哥张维扬（夏雨）把他们送到了医院。孩子脱离危险后，赵小芸发现钱不见了。但她乃是吴芮之女，可谓是出身名门。按照你说的，这个游戏大概两三个月就能做好。