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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.从古到今的国术宗师加在一起，也没有多少个。第十王国是由雪姑七友、小红帽、睡公主、灰姑娘、国王的新衣等等大家耳熟能详的童话故事，再加上人狼、食人怪、仙女、邪恶女王等等的幻想世界人物，所组合而成的一套史诗式浪漫爱情冒险故事。　　故事内容基本上环绕着一对生活在美国纽约市，中央公园附近大厦的父女，在一次机缘巧合下遇到一只来自异世界，听得懂人们说话的一头狗，但亦因为这样而被来自异世界的人狼及食人怪追杀，他们为了逃避，结果与那一头狗走进了一度通往异世界的入口，进入了他们从没想到的世界——第九王国。　　他们在异世界中，一方面要逃避邪恶女王的手下追杀，另一方面亦要找寻回到现实世界的方法，但他们每进入一个国度，也经历及见识了不同的世界，从而产生了不少刺激、紧张、浪漫的冒险故事。每天忙到天黑才归家，今天因为去了孔雀王府，就回家早了些。Little Charlie closed his eyes, put his hands together, put them in front of him and said softly, "Dear Santa Claus, I want to see my parents before next Christmas and dress up the Christmas tree with my grandmother..."L PM2.5 dust, toxic smoke and water sources