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"What was your first reaction when you saw these flying insects?" AskedFor interface programming, a lot of changes that may occur in the system in the future can be isolated. Why? If the code is written for an interface, he can implement the interface with any new class through polymorphism. However, when the code uses a large number of specific classes, once new specific classes are added, the code must be changed. Violating the opening and closing principle.随着杨长帆和两位军官后撤，除了那位老兵外的所有人也都后撤了，留着可怜的老兵，拿着火镰发呆。The Spirit of Zodiac-Pig德国ARD和ZDF电视台联合推出。讲述了一个手机APP下载后 只要你完成相应任务就能满足愿望，一开始这5个年轻人的愿望很单纯，后来随着事态发展，内心的欲望被打开，当邪恶逐渐被揭露，他们的生活再也回不到过去了…….You can engrave your name on the cover"As long as they are hit, they are basically shot one at a time. The lethality of steel balls is much smaller than that of bullets. A dozen or twenty bullets can also kill one. They are animals after all, and they are still afraid of bullets. However, the speed is fast and it is really difficult to deal with." Liu Guangyuan said.