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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.True and False Contrast范增认为虞姬本人对于项羽的命数和王者之气并不好处，某种程度上还会威胁到相遇的的王图霸业。韩信这心里也是着实的郁闷，甚至有些愤怒。公元1711年，康熙五十年间一个风雨交加的夜晚，四王爷胤禛的妃子艰难的产下一个女婴，与此同时内阁大学士陈世倌的夫人也产下一个男婴。四王爷为了争夺皇位，把生下女儿的妃子残忍杀害，并将知情宫女、侍卫一一灭口，强行换走陈世倌所生男婴，对天下谎称是自己的亲生骨肉。这个汉人血统的男婴就是后来的乾隆皇帝。这个惊天秘密引发了江湖与朝廷的大对抗。Focal length, also known as MF. It refers to manual focusing. When taking photos, you need to click on the screen to determine the focus.