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Visitor mode is to encapsulate some operations applied to a certain data structure. Once these operations need to be modified, the data structure that accepts this operation can be saved unchanged. Visitor mode is suitable for systems with relatively stable data structures. It reduces the coupling degree between data structures and operations acting on data structures, making the set of operations relatively free to change. The specific structure diagram is as follows:The above analysis shows that one of the first three situations will inevitably occur after intercepting down, so intercepting down is no longer considered here. Let's look at the difference between events after intercepting down.As shown in the above figure, when ping 156 host, the PING command has not been responded to. It seems that our iptables rule has come into effect. The message sent by ping has not been accepted by 156 host at all, but has been discarded, so let alone any response. Well, we have successfully configured an iptables rule. It seems that we have already started.　　台湾知名演员刘雪华曾经因为琼瑶剧而被内地观众所熟识。此次她在《如意》里饰演谭家一把手谭夫人，作为刘雪华多年粉丝的朱泳腾进组后和刘雪华第一场戏竟然紧张到忘词。“在戏里雪华姐是我不共戴天的仇人，得知要和她对戏后，我已经不是紧张那么简单了，简直很梦幻。因为不敢想象！到了片场第她尚不识情爱为何物，只觉得葫芦哥哥看着蝉儿师妹的样子让她心中隐隐作痛。人到四十的香港某中学国文教师林耀国是一位“好好先生”。念书时是学校里有名才子的他，面对飞黄腾达闲来打打高尔夫的昔日同窗，只收获了一份难言的失落，但在他的“坏学生”胡彩蓝眼中，他却是有内涵的成熟魅力男。胡彩蓝身上有几分林耀国妻子文靖当年的影子，她的大胆示爱令林耀国勾起一段深埋在心底的往事，一时令他无所适从，然而他却必须做出选择。　　马尔科姆·X早年曾加入黑帮，他在狱中悔悟，加入穆斯林教，出狱后成为一名黑人人权领袖。他口才极佳，办事雷厉风行。与马丁·路德·金不同，马尔科姆·X主张暴力革命。后期他态度有所转变，与伊斯兰民族组织决裂，变得相对温和，但一直坚定主张“采取任何措施追求进步”。1965年，他在一次演说中被伊斯兰民族组织成员刺杀。