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2. Then add a cache list to the publisher to store callback functions to notify subscribers (for example, the above buyer has collected the seller's store, and the seller has collected a list list of the store).在一万年前的最后战争里,地球的南半球消失了.而以往的高度文明灭亡,取而代之的是被大自然所覆盖的野生大地.同时有著人和兽二种姿态被称呼为beast的兽人们,与大自然一起和平生活了很长的一段时间.但某天,一个自称休曼的种族降临在地球上,他们为了找寻长眠于这个大地的神秘力量盖亚而开始对各兽族进行侵略.兽族族长的独生子汪达,鸟族长老之孙巴特,人鱼族的公主梅玛,以及龟人梅卡被休曼族袭击并囚禁起来,但休曼研究所的巴士瓦特博士希望汪达等人带著其孙女悠妮逃离休曼族的掌控,因此协助他们逃离空中要塞,不过却在半途遭到追兵拦截,巴士瓦特博士也因此丧命.此时,兽族,鸟族,人鱼族的三具石像复活,成为三具神灵机,带领汪达等人摆脱敌人的追击。该剧是《不要单身要恋爱》的系列剧第二部。The above is only a model of "Long En" bicycle, If you need to generate other types of bicycles, Other subclasses can be written. The most important advantage of factory mode is that some of the same methods can be implemented. We can write code in the parent class for these same methods. If we need to implement specific business logic, we can rewrite the parent class's methods in the subclass to implement our own business logic. In terms of professional terms, there are two points: First, weaken the coupling between objects and prevent code duplication. Instantiating a class in a method eliminates repetitive code. Second: Repetitive code can be written in the parent class. Subclasses inherit all member attributes and methods of the parent class. Subclasses only focus on implementing their own business logic.在狗熊岭百年不遇的大雪中，熊二偶遇了小时候曾有过一面之缘的神秘小伙伴，除了重逢的喜悦，小伙伴也给熊二带来了不少麻烦：穷凶极恶的追猎者、神秘而未知的重大传说。一系列的阴差阳错，熊大熊二光头强和动物们不可避免地被卷入其中。在小镇和森林中，他们闹出了不少惊险又好笑的意外，在传说的驱使下，一行人踏上了前往白熊山的旅程，一路上，他们经历了欢笑和感动，勇气日渐增长，友谊也越加深厚，熊大和熊二学会了理解对方，矛盾也渐渐地化解。可是，一场灾难意外地爆发，在千钧一发之际，熊二鼓起勇气，承担起了拯救大家的责任，危机最终圆满解决。网络小说已经发展十几年了。长帆并未打过硬仗，绍兴大捷只是时机得当，若在南京孤军抗鬼倭，结果难料。