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Simply put, we subtract the number on our right (health value) from the number on the left (attack value) of the enemy. If the result is less than zero, we will die.一群任性的青少年在野外新兵训练营必须为他们的生命与一个无情的吸血外星人的攻击斗争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.二人定睛一看，那个穿棉袍的是郑青木，另外两人则是黄瓜和黄豆。So here, let's talk about iptables for Linux最近军士们都勤快的很，想尽了办法找野食，他们伙房的人可沾光了。洗漱一下，炒了一点蛋炒饭，然后他一边端着饭碗。