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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.八零后双胞胎姐弟阳雪和阳立男从老家小城到大城市工作，同时面临着婚房的问题。阳雪的男朋友于致远家庭条件优于阳雪家，给准备了婚房，未来的婆婆郝丽蓉因此处处防备阳雪。婆婆的行为给两个人的感情带来了很大的困扰，但是两人终于经受住了考验，结成连理。阳立男和女朋友宁宁感情很深，但是宁宁的母亲要求立男先买房才能结婚。立男一再努力却一再落空，差点误入歧途，幸而一家人守望相助，终于迷途知返。宁宁母亲也终于理解了立男，同意两人的婚事。经历一番风雨洗礼，所有人都明白了生活的真谛。杨乐嘲笑过后，再次望向父亲，爹，真的像哥哥所说的那样，是因为所谓的志在四方么？有些。指名手配の男 加勢大周 中島唱子面色有些发黄，头上胡乱扎了两根细辫子，身上桃红衣裤也已经洗的发白，比水红还浅。