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…,随即目光落到高易、陆明和同大三人身上，说道：山yīn的成绩我都看到了，这两年辛苦你们了。Generally speaking, a delegate is a class that maintains a field inside and points to a method. Events can be regarded as variables of one delegate type, and multiple delegates or methods are cancelled through event registration. This article uses delegate and event execution methods to understand the difference between the two.送进新人居处——东面竹院，有当时摆出来的，也有收进库房的，色色都安置妥当了。神秘的巨型机甲——“天狼号”从天而降，三位地球少年误闯入机甲内，由此结识了操控“天狼号”的天狼星人，并与之一同对抗邪恶的外星势力。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.