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Iterator pattern provides a way to access each element in a collection object sequentially without exposing the internal representation of the object, which can not only not expose the internal structure of the collection, but also allow external code to transparently access the internal elements of the collection. The specific structure diagram is shown below.Two years ago, family changes and bad marriage caused Mary to have a mild depressive reaction. But on the surface, Mary is more "happy" than before. "I just try my best to feel that I am very good and cannot let others know." Mary said. She covered up everything with a smile or positive energy expression, but her inner depression snowballed until the night two years later, when it completely collapsed.改革开放之初。大明湖畔摔跤的夏传武和说快板书的曲闻声两家，因为旧怨，势不两立。夏家大女儿、知青夏小荷与农村小伙窦爱国相恋，为了返城不得已与窦爱国分手。回城后，夏小荷与曲家大儿子曲大明经历重重波折，终于结婚。夏小荷从摆地摊开始，靠自己的努力一步步实现自我价值。曲大明在夏小荷的激励下，也从普通技术员成长为车间主任。夏家小女儿夏小雨嫁入知识分子家庭，生活却并不美好；曲二明被工厂开除，后来却成了救人英雄；暗恋夏小雨的曲三明高考失利，远走深圳成了当红歌手，后来一无所有只能黯然回乡。无论成败，每个人都在改革开放的大潮中经受洗礼获得成长，原本水火不容的夏传武和曲闻声，也因为夏小荷儿子的出生，最终化干戈为玉帛(1) There are five kinds of creation modes: factory method mode, abstract factory mode, singleton mode, builder mode and prototype mode.This is a more dangerous exception to fastening the belt. A new study shows that weightlifters wearing belts have a higher injury rate than those who do not wear belts. Researchers believe that the possible explanation is: "When you already feel pain, the weightlifting belt conceals the feeling of pain and creates a false sense of security, thus ignoring the pain. Later, when you lift weights without a belt, you are more vulnerable to injury." In this regard, the researchers' suggestion is to strengthen the strength exercise of your core parts, which are born with supporting points.Publish-subscribe mode is also called observer mode. It defines a one-to-many relationship between objects, allowing multiple observer objects to monitor a topic object at the same time. When an object changes, all objects that depend on it will be notified.小姑娘高兴地大叫一声，扑向一旁的方桂花道：方姐姐，我终于能当女将军了。