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Summary: This Daniel, I think you may have accumulated a lot in. NET and done a good job, attracting a large number of fans. I admire you very much. However, you may not know much about in-depth learning. For an area that you don't know very well, you are not modest here, turn a deaf ear to other people's suggestions, and are also very proud to swear at "spitting". I'm afraid you still need to be more modest and learn more. Judging from the working age, I am your successor, but judging from the field of in-depth study, you may still be a newcomer, don't you think? And so far, you have sent two articles on the front page, none of which have any dry goods. I hope you can hit me in the face with dry goods quickly.　　导演：祝东宁《唐砖》《致我们暖暖的小时光》《恋爱那点事儿》122. X.X.1991941年12月。飞行员尼古拉·科姆列夫成功地执行了命令，他奉命摧毁了前往莫斯科的德国坦克纵队。但科姆列夫的飞机被敌方战斗机击落，他奇迹般地将他的伊尔-2号攻击机降落在荒凉的森林空地上。看来最可怕的事情已经过去了，他在一场空战中幸存下来。然而，真正的考验才刚刚开始：受伤的科姆列夫必须穿越一条不可思议的道路，克服霜冻、痛苦和饥饿，远离狼群，逃避纳粹特种部队的围剿，他们要不惜一切代价找到他。飞行员怀揣着求生的意志、勇气，当然还有爱：奥尔嘉还在家里等着他归来。她的身影温暖了他，驱策他前进、脱困。他只有一次生还的机会，回到他心爱的人身边，再次登上天空，赢得胜利。This trip to the countryside gave me a deeper understanding of the basic situation in our country's countryside. We all went to places with high incidence of cancer, and personality is Shexian, the place with the highest adjusted mortality rate in the country. After investigation, the local environmental pollution is relatively serious. Although there are "Top Ten Well-off Villages" and more factories have brought economic benefits, they have also brought great pollution to the local environment. In the past, farmers had to drink polluted water. At the moment, deep wells have been drilled to drink clean and sanitary water. However, many factors in various fields still cause the high incidence of cardiovascular diseases and cancer in the area. Some families have seen the phenomenon of "poverty due to illness and returning to poverty due to illness". The implementation of the national new rural cooperative medical system has effectively relieved the economic pressure of patients' families. To a certain extent, it has curbed the phenomenon of returning to poverty due to illness and causing poverty due to illness, promoted the development of rural health services, promoted the change of farmers' concept of seeking medical treatment, and also enhanced the image of the Party and the government for private affairs. However, many farmers still do not know enough about this policy.As the name implies, iterator pattern is to access objects in an aggregation sequentially. Generally speaking, it is very common in collections. If you are familiar with collection classes, it will be very easy to understand this pattern. This sentence contains two meanings: one is the object that needs to be traversed, that is, the aggregated object, and the other is the iterator object, which is used to traverse the aggregated object. Let's look at the diagram: