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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.招福（刘青云 饰）原本是个不可一世的少爷，母亲是个寡妇，一心想儿子可以成家。招积（黄子华 饰）是招福的堂弟，也是招家的第二继承人。招积一直对招福不满，于是在街头游说在街头卖艺的望弟（吴倩莲 饰）与招福结婚以骗取聘礼。成亲当天，招积故意让招福在高处坠下，招福自此变成了痴呆，望弟与父亲（元华 饰）趁机逃走了。不久，望弟遇到了流落街头的招福，处于内疚与同情，望弟收留了招福。/belch　　刚刚18岁的大姑娘方瑾，为了家中病重的父亲，为了弟妹们能有口饭吃，不再受苦，只有和自己的心上人高以后你们不要问我为什么跪着看《佛本是道》。1901年八国联军占据北京，清政府为了议和答应为德国钦差克林德修一座牌坊，茂兴营造厂百般推脱，而掌门人蒯鹤年为救京城百姓，为保住工匠手艺的传承最终舍身取义，一人忍辱负重修好了牌坊，在牌坊落成之日自尽。