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So let's explain the rules of iptables in a common way. There was an analogy before, Each "chain" is a "checkpoint", Every message passing through this "level" must match the rules on this level. If there is a match, The message is processed correspondingly, For example, you and I are like two "messages" at the moment. Both of you and I are going to enter the customs at this moment. But the duke has a life, Only the imposing person can enter the customs, Those who do not meet this requirement are not allowed to enter the customs. So the soldiers guarding the customs followed the "rules" formulated by the duke. I began to look at you and me. In the end, you entered the customs smoothly, and I was rejected. Because you met the standard of "dignity", you were "released", while I did not meet the standard, so I was not released. In fact, "dignity" is a kind of "matching condition", "release" is a kind of "action", and "matching condition" and "action" form the rules.盖尔·德夫（雷·温斯顿）曾经是叱咤伦敦东区的一名江洋大盗，如今他已金盆洗手隐居田园，和爱妻迪迪（阿曼达·莱德曼）及小男仆安利奎住在西班牙一所幽静的山间别墅里；闲来无事时，同两个邻居兼旧友艾奇、杰基凑上一桌牌打打，小日子过得真是自在惬意。 　　只可惜好景不长，另一位昔日同伙唐·劳根（本·金斯利）的不请自来一下子搅乱了盖尔他们的宁静生活。唐暴虐的脾气和神经质的言行让每个人心中都惴惴不安，更加令大家惶恐的是：唐的此番来访将会使盖尔重新陷入麻烦和危险之中。原来，伦敦大恶棍泰德·巴斯（伊恩·麦克什）和金融家哈里精心策划了一次抢劫英格兰银行的行动，其中唐也有份，他这次来的目的就是要将盖尔也拉下水，以协助他们完成计划。 　　为了妻子的安全和幸福、为了捍卫自己得来不易的和平生活，从西班牙到伦敦，盖尔义无返顾地同唐一伙人展开了意志、胆量与力量的较量……第三刑侦小组由三名警官组成。他们是复转军人靳德祥、刘刚，警校毕业生李小奇。这个小组的职责是侦破、打击形形色色车匪路霸的犯罪活动。大学舞蹈系学生柳芸儿，宏大公司业务部经理虞小娟，丽都酒店经理郭薇，三位年轻、漂亮、事业有成的现代女性，向人们诉说着一段段传统的爱情故事。从老山前线转业现任宏大公司总裁徐鹏、失学流浪儿小四川及杨小莉、刘荣荣等，从不同的矛盾当中体会他们对这个刑侦小组的情与敬。你是否也曾遭遇过，爱上了不该爱的TA：是鼓起勇气面对，还是选择默默守候。This class can meet the basic requirements, but if we put a class like this without thread safety protection into a multi-threaded environment, there will definitely be problems. How to solve them? The first thing we think of is adding the synchronized keyword to the getInstance method, as follows:李敬文看着泥鳅欲言又止。　　高利