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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.马的蹄子有两层构成，和地接触的一层是一层大约寸许厚的坚硬的角质，上面一层是**角质。欧天擎意外和前妻童沫相遇，得知童沫曾经流产，欧天擎无法接受。他暗中调查，却意外发现童沫当初流产竟是因为自己。A printed board with conductive patterns on both sides.大都会繁华璀璨，可是一班寄居在社会低层的弱势群体，不单止享受不到繁荣带来的富足和温饱，反而遭到压榨和剥削，幸而，在浊世之中，仍有人挺身而出，为这群可怜人仗义执言，他就是盲侠大律师。还有我二姐，也太……所以就……这也是没法子的事。　　小时候失去父母，被姐姐抚养长大的女主角向打乱姐姐人生的女性复仇，惊险急速展开的痛快爱情悬疑剧。