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不但快，还稳、准、狠。Modern equestrian sports originated in England and were introduced into Europe in the 16th century. The 2nd Olympic Games in 1900 was included in the competition. Equestrian events are divided into dressage, obstacle surmounting and three-day events, each of which is divided into team and individual events.两人边吃边轻声说话，忽然鲁三敲门，原来是王穷小厮找他，说是翰林院来人找他。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.高三毕业在即，顾小满为了能与男神左岸继续做同学，拿出练习散打的精神死磕学习。自身刻苦努力加上天才学霸左岸的独家指导，顾小满达成最强逆袭，成功与男神考入同一所大学，向着爱情和学业一路高歌猛进。如果说高中生活两人之间是暗戳戳的小互动不间断，狠狠撩拨观众的少女心。那么大学生活则是依旧笑料不断，两人敞开发糖，甜度升级翻倍。都说最甜不过双向暗恋，两个初心萌动的人在靠近彼此的路上最是甜蜜有爱、百看不倦，甚至连途中的“意外”事件都显得萌趣十足。于是，看看差不多了，板栗便向他致歉一声，和葫芦、李敬文退下了，任由他们闲话家常。