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一晃两年过去了，时局发生了很大的动荡，阎家寨这个高原上的寨子似乎还保持着往日的平静。只是，东升回来了……3. Some classes, such as the core trading engine of the exchange, control the trading process. If multiple classes can be created, the system will be completely messed up. (For example, if there are multiple commanders in an army who command at the same time, there will definitely be a mess), so only by using the singleton mode can the core transaction server independently control the whole process.井陉口，赵军大营。User class unified interface, User1 and User2 are different objects respectively, and they are related. If the mediator mode is not adopted, the two need to hold references to each other, so the coupling degree between the two is very high. In order to decouple, the Mediator class is introduced to provide unified interface, and MyMediator is its implementation class, which holds instances of User1 and User2 to control User1 and User2. In this way, User1 and User2 objects are independent of each other. They only need to maintain a good relationship with the Mediator, and the rest is maintained by the MyMediator class! Basic implementation:新的城镇，新的学校生活，以及新遇到的朋友。魔女学校中的扫帚飞行课程以及充满魔法气息的不可思议的授课等等，在这些只有魔女学校中才有的课程当中，阿科与萝特、苏西等人引发了大骚动！Single panelHunting Bow: Deals 3 times of damage to wild monsters.