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"Then it was the old method of tracing armour-piercing firebombs that repelled the attacks of the big wasps twice. There was another very special sound from the position. At first we thought there was another big wasp coming, But after looking at it for half a day, I didn't find anything. After a little while, It is also the kind of special sound that is getting closer and closer. Only then did I recognize that it was not the "buzzing" sound of the big wasp, But a sound of "knowing, knowing, knowing, knowing, knowing, Taken out with 'creaking', It's like a lot of people grinding their teeth together, Then a piece of black came running in the direction of the position. This time the direction is straight ahead, At first those things were far away from us and we could not see them clearly with our naked eyes. It was an instructor with a telescope who looked through the telescope and saw that the thing was a lot of mice. And they are all very big, After the news spread throughout the position, I have all my comrades, All ready for battle, Knowing that this is like one of those big wasps, It is certainly not a good fault, Just thinking of starting to fight the newcomers when it comes closer, I didn't think they were about 100 meters away from the position. It stopped suddenly, At the beginning of digging holes collectively, I felt that they were digging holes faster than running on the flat ground. One by one, they almost disappeared from the ground in an instant. Soon, a large area of dark mice disappeared. Looking through binoculars, on the ground where they disappeared, there were many holes the thickness of sea bowls, which were almost denser than craters.董翳肯定比谁都紧张，由他去吧，我可不想留在河北陪他玩。在命运的交叉点，当麻和焚流能否阻止世界的灭亡？　　眼盲心亮的美女DJ晶晶坐地铁去电台，而工作陷入瓶颈的云翔也赶巧坐这班地铁回家。两人曾很多次同坐这班地铁，似乎就是被命运作弄，一直无法邂逅。偏偏这一天，一向冷酷的云翔却目睹有人抢了晶晶的皮包，他在扶住几乎要跌倒的晶晶时被这个清新脱俗的盲女给吸引住了。IV. Application Value of BIM Technology in Operation and Maintenance麻省理工学院的数学教授蓝波在席上公布了一道困难的数学题，却被年轻的清洁工威尔（马特·戴蒙 饰）解了出来。可是威尔却是个问题少年，成天和好朋友查克（本·阿弗莱特 饰）等人四处闲逛，打架滋事。当蓝波找到这个天才的时候，他正因为打架袭警被法庭宣判送进看守所。蓝波向法官求情保释，才使他免于牢狱之灾。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.