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两艘船始终沿着岸边百米左右前行，越来越近。The first one will last for 3 minutes, and the second one will last for 1 minute.香荽对宁静郡主微笑道：多谢郡主。Sister Ping said that she didn't think too much about dyeing vegetation, but simply wanted to do one thing well. As to whether it could produce economic benefits, she didn't specifically consider it. I wish I were happy to do it.前任院长蛭间重胜（西田敏行饰）被赶走一年后，东帝大学医院诞生了第一位女性院长，她提出“患者优先”的口号，开始进行大刀阔斧的开革，清除医局的腐败。但是盘踞在医院的当权者们为了夺回自己的利益，复兴以绝对权力和森严等级统驭的“黑色巨塔”，开始暗中活动。左迁至东帝大学医院知床分院的蛭间重胜也蠢蠢欲动。天才的外科医生大门未知子（米仓凉子饰）与被污染的医疗组织展开正面对决。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.