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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."Is there any big mouse like that you mentioned before?" I asked."Supporting" is also called "lifting". 1. Holding and supporting; Carry. Song Lu You's poem "Small City" reads: "The window of the temporary rest porch is still swept away during the flood season, and the book and sword of the long journey are also supported." The second chapter of Part a of Kang Youwei's "Datong Book" reads: "It is very clear that the crying is full of ears, the water walks away, the family carries something, the face is covered with tears, and the sky is swearing." 2. Means a container that can be suspended. Tang Du Fu's poem "Stone Shrine" reads: "Bitter clouds are straight away and cannot be supported." 3. Care; Foster. "Biography of Xiao Jingxian in the Book of Southern Qi": "Jing Xian was seldom lost by his father. He was very kind and Taizu Jia. And from the official capital city, often support each other." Tang Liu Deren's poem "Express My Feelings in the Mountain and Send Ding Xueshi" reads: "I am very fortunate to be clumsy and happy, and I have no doubt about my support." Volume 13 of "Surprise at the Second Moment": "The magistrate of a county called the Liu family's son to see it and said to Zhisheng, 'Such a child is just the right support." " Shen Congwen's Wang黎水也佩服地说道：被拉去祭旗还能镇定自如。……王突和胡钦惊呆了，万没料到是这个结果。许莹生长在一个极度重男轻女的贫苦家庭中，懂事又乘巧的她平时稍有不慎，便会遭到父母的打骂。小学六年级的某个冬夜，弟弟许拓为煮面而酿成大火，拓从此跛了一只脚，而莹的左肓也被在火留下了一大片疤痕。在医院里，莹独自面对孤寂，感受着没有亲人疼爱的凄凉。此时的莹幸运的遇见了一对来自台北的兄弟，乐观开朗的顾子谦和患有心脏病的弟弟顾子山因同情莹的遭遇，对她疼爱有加，这令莹小小的心灵中，点燃起希望的火花。莹在医院的日子里，于谦和子山为她带来了生命中从来没有的阳光。予谦曾对莹说过，萤火虫的灵魂会依附在她的伤疤里，永远守护着她，直至一生一切。