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若非如此，臣等很难在短时间内顺利掌控山yīn城，更做出器其他的成绩来。CollaborationThose outstanding experts can connect working memory with long-term memory, and can call up a larger capacity of working memory when performing professional activities such as piano and chess that they are familiar with. As Simon and others pointed out in their groundbreaking research report in 1973, chess masters have stored 50,000 to 100,000 chunks about chess games in this hard disk for long-term memory.22. Mediator)No.42 Ju Zhiyan? Revise and perfect.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.