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The principle of opening and closing means opening to expansion and closing to modification. When the program needs to be expanded, the original code cannot be modified, but the original code should be expanded to achieve a hot plug effect. Therefore, a summary of one sentence is: in order to make the program scalable, easy to maintain and upgrade. To achieve this effect, we need to use interfaces and abstract classes, etc. We will mention this point in the later specific design.出身警察世家的尹平安为人懒散，他的兄弟尹明扬是警界神枪手，夺“金枪”之誉，却不幸在一次追捕黑社会两大集团的混战中中枪惨死，明扬之友方正右手受伤致残，后其苦练左手，终回复当年枪法，并暗中追查杀害明扬之凶手。Resource confrontation is also called "dead shoulder", that is, through the piling up of a large number of servers and bandwidth resources to achieve the effect of calmly dealing with DDoS traffic.I forgot the specific episode, but it was also the first few episodes of the second season.除夕之夜，灾难突如其来地发生了，雪崩骤至……400多人惨死冰天雪地的金刚山里，事件迅速惊动了省和中央，白玛市金刚山现场指挥部紧急成立，直升机，救护车，公安武警部队，记者等开向现场…… 雪堆中，方华生家和丹巴家这两个白玛市最大的家族儿女，公安局派进华生黄金公司的卧底，华生黄金公司的会计，暗中追查华生黄金公司内幕的北京记者等不幸遇难……小国和奈美是一对关系要好的姐妹，然而父母正在闹离婚，同时她们所上的小学也面临着废校的危机。为了留下美好的回忆有同学提议组队参加舞蹈大赛，妹妹奈美跃跃欲试，而姐姐小国却提不起兴致，奈美苦于得不到姐姐的支持，此时随着转学生风香的到来，事情似乎有了转机。