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The observer pattern defines a one-to-many dependency, allowing multiple observer objects to listen to a topic object at the same time.史诗传奇大戏《铁梨花》讲述的是一个出生在晋陕交界盗墓贼家的女儿，在横跨军阀混战直至抗日战争，这段动荡岁月里中，与身边的亲人、爱人、朋友甚至仇敌共同演绎的一段传奇岁月，先后与几个男人间的爱恨纠葛，以及她从一个普通人家女儿、到军阀家的姨太太、再到坚定抗日的民族志士的心路历程。民国，晋陕交界，黄土坡上迎来一顶鲜红的花轿，雄踞一方的赵旅长竟然娶了个盗墓贼家的女儿做五姨太。被抢亲的女孩名叫凤儿,她父亲曾经编造了一个关于铁梨花的传说。也正是这个传说，让她这一生都颠沛流离，不得安生。她骑烈马、喝坠胎药，只为逃离这个富贵宅邸。在横跨军阀混战直至抗日战争这段动荡岁月里中，她与身边的亲人、爱人、朋友甚至仇敌共同演绎了一段传奇岁月，先后与几个男有过爱与恨的纠葛，她从一个普通人家女儿，到军阀家的姨太太，最后成为坚定抗日的民族志士。二十年后，方圆几百里的盗墓人中传诵着一个名字：铁梨花。"What was your first reaction when you saw these flying insects?" Asked我只是在等待一个遥远的答案。秦旷傻傻地问道：开……开铺子？香儿妹妹会做生意？白果傲然点头道：那当然，我家小姐可聪明了。Iterative sub-patterns: Iterative sub-patterns can sequentially access elements in an aggregation without exposing the internal appearance of the aggregation. The aggregation of multiple objects is called aggregation. Aggregation objects are container objects that can contain a group of objects. Iterative subpatterns encapsulate iterative logic into a separate subobject, thus separating it from the aggregation itself. Iterative subpatterns simplify the aggregated interface. Each aggregated object can have one or more iterative subobjects, and the iterative states of each iterative subobject can be independent of each other. Iterative algorithms can be independent of aggregation role changes.