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The world is very complicated, full of phenomena, facts and various viewpoints (insights, lies and deception). We need to extract the consistency behind them in order to quickly understand and understand the world. This consistency is the dimension in the classification. The classification of the three worlds is just to find a classification method for countries that we have not used before. The traditional classification of countries is based on geographical location (five continents), population (large and small countries) and development stage, while the three worlds are classified according to their relationship.The other is a disguised ACK packet that responds to SYN-ACK to reach the server through firewall/proxy. This disguise prevents the TCB of the server from staying in the SYN-RECEIVED state, thus ensuring free space in the backlog queue. The firewall/proxy will stay and wait for a period of time. If the correct ACK of the connection initiator is not detected, it will pass through the disguised TCP? The RET message causes the server to release the TCB. For legitimate connections, packet flow can continue without the influence of firewalls/proxies. This method is more attractive than the above method of disguising SYN-ACK, because the firewall/agent does not need to directly participate in the connection after the legal connection is established.As a person who knew crayfish very well from an early age, I also lost money because I was too confident and thought I was smarter than others. Therefore, novices must be careful when entering. They should not think it is easy to raise crayfish and think it is easy to earn money.影片讲述了一名退隐王牌保镖为救女儿与一群亡命之徒展开殊死决斗的故事。达容曾是东南亚最顶级保镖，在一次执行任务的过程中，行动失败导致兄弟惨死，妻子也因意外去世，伤心失意的达容从此退隐江湖过上了平凡的生活。不料叛逆的女儿遇人不淑，不小心卷入了一桩罪恶的毒品交易中，并被亡命之徒绑架，为救女儿，达容不得不重出江湖，孤身踏上营救险途……Therefore, in order to jump out of the poor's thinking caused by scarcity, we must force the important things into the pipeline vision-make a clear life plan, short-term and long-term, and then realize it step by step.趴了一整天，身上可难受了。