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身处两个天界贵公子中间，加上天界和魔界的斗争，单纯的锦觅注定无法如母亲所愿安度此生……One problem with the factory method pattern is that the creation of the class depends on the factory class, that is to say, if you want to expand the program, you must modify the factory class, which violates the closure principle. Therefore, from the design point of view, there are certain problems, how to solve them? We use the abstract factory mode to create multiple factory classes, so that once new functions need to be added, we can directly add new factory classes without modifying the previous code. Because the abstract factory is not very easy to understand, let's look at the diagram first, and then it is easier to understand with the code.　　黑龙江省边境小镇黑河，在时任警备司令的马占山治理下，百姓安居乐业，却不料日军悍然发动“九一八事变”。马占山临危受命，被任命为黑省代主席，总揽军政。(2) How to realize seamless mapping on curved surfaces?泥鳅把灯笼留了下来，那一团昏黄的亮光，给小葱身上笼罩了一层朦胧的光圈，衬托得溶洞内越发静谧、幽暗。网剧《Replay》是一部讲述虽然一切生疏不安，但最纯洁的18岁年轻人的梦想和爱情的共鸣罗曼史，今年冬天将传达温暖的情感。弗朗西斯科之所以最终选择妥协，其实也是以为北美洲的利益有限。