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然心底却隐隐横了根刺，满脑子都是一副烛光摇曳、红袖添香的温馨图景。　　清醒后，两队人马突然发现，迎接他们的竟然是——女真族的斧头。原来，他们在彗星带来的龙卷风中，穿越时空回到了1572年。女真族被他们用枪打跑，晚上躲在一个山洞，想不到竟被当地的一个名叫李舜臣（朴重勋 饰）的年青人把武器全偷走。陷入困境中的这些现代人，在武器被盗的情况下，是否能打败女真族的斧头，并返回现代社会呢？即便是一个环节多有疏漏的假设，在众人心中确实无限放大，继而得到推论项羽手中的传国玉玺是真的。Visitor pattern decouples the data structure from the operations acting on the structure, making the operation set relatively free to evolve. Visitor pattern is suitable for systems with relatively stable data structure and easy change of algorithm. Because visitor mode makes it easy to increase algorithm operation. If system data structure objects are easy to change and new data objects are often added, visitor mode is not suitable. The advantage of visitor mode is that it is easy to add operations, because adding operations means adding new visitors. Visitor mode centralizes the relevant behaviors into one visitor object, and its changes do not affect the system data structure. Its disadvantage is that it is difficult to add new data structures. -From Encyclopedia这情形进入六月才好些。We know that IPTables acts according to rules. Let's talk about rules. Rules are actually predefined conditions for network administrators. Rules are generally defined as "if the packet header meets such conditions, this packet will be processed in this way". The rules are stored in the packet filtering table in kernel space, specifying the source address, destination address, transport protocol (such as TCP, UDP, ICMP), service type (such as HTTP, FTP, and SMTP), and so on. When packets match the rule, iptables processes these packets according to the methods defined by the rule, such as accept, reject and drop. The main task of configuring a firewall is to add, modify, and delete these rules.Fanclub: