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During the establishment of a tcp connection, If the server returns syn and ack messages, The client does not confirm it for some reason. This is because the server needs to retransmit the syn + ack message and wait for the client's confirmation message until the tcp connection timeout. This state of waiting for the client to confirm the connection is usually called a half-open connection. The half-open connection will be kept in the connection table of the server until the connection is disconnected.与《亮剑》、《历史的天空》等英雄史诗剧有所不同的抗战剧《杀虎口》近日正式与观众见面。该片由新锐导演徐纪周打造，并集合了李光洁、唐于鸿等一批80后演员。 　　李光洁此次在剧中饰演八路军首领白朗，土匪出身的白朗一心想把自己的队伍搞成梁山泊好汉，而非规范的共产党抗日队伍。谈及自己对于角色的理解，李光洁表示并不愿意把白朗的形象只是定位于具有匪气的抗日英雄，因为“白朗的性格其实是有很大缺陷的，这部戏实际上就是白朗个人的成长史”。刘邦能那么顺利地拿下彭城吗？彭越完全没有在乎，彭城之战中刘邦的惨败和狼狈造成的影响。至少自保，留条退路是有可能的。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:该剧讲述了从灵光嫁到高昌后，30年来独自养育子女的农产品批发商灵光宅(高斗心饰)在美国接受医疗服务的儿子成柱(赵东赫饰)带着陌生的异国人秀智(姜恩珍饰)突然回国后发生的故事。