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Return string [i];　　直到有一天，他被骤然爆发的血雨腥风抛向了命运的惊涛骇浪，欲逃无路，欲罢不能。从此，十分惜命的草根贱民板凳与命悬一线的中共党员唐雪梅及其“女儿”小女孩红儿，结下了不解之缘，彼此间发生了一连串的恩恩怨怨、分分合合，以及心灵的碰撞、情感的纠葛。而令板凳命运突变和陡转的那一天便是1927年4月12日。该剧讲述一群比坏家伙们更坏的人，然而就是这样一群人，却用专属于他们自己的手段为社会除暴安良。小娃儿憋了一会，终于忍不住，凑近郑氏耳边小声道：娘，鸡叫了。The actual operation of iptables will be summarized into other articles. The direct link to the list of iptables series articles is as follows: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.