"Is-A" refers to the "one" of one class and belongs to another class, while "Has-A" is different, which indicates that a certain role has a certain responsibility. A common reason for the wrong use of inheritance instead of aggregation is to mistakenly treat "Has-A" as "Is-A". For example:
A TCP connection is a quad, and a connection is uniquely determined by the source IP, the source port, the destination IP and the destination port. Therefore, if C wants to forge the packet from A to B, it should fill in the above-mentioned IP header and TCP header with the source IP, source port, target IP and target port. Here B is the server, IP and port are open, A is the target we want to attack, IP certainly knows, but the source port of A is not clear, because it may be randomly generated by A. Of course, if we can find out the rule of generating source port for common OS such as Windows and Linux, we can still do it. In addition, we can step on the connection port of Car A through a large number of controlled hosts.
《射天狼》主要讲述了辛亥革命到抗日战 争爆发前，发生在大西北的一段传奇故事 。该剧重要情节是围绕着日本人在敦煌莫 高窟全力寻找古老奇书《西域水考》展开 的，这部手稿主要记录了这条丝路上的水 源，只有了解沿途的水源所在，才能通过 这条丝路。而日本人寻找手稿的目的，也 正是为了把这条丝路牢牢控制在手里……
孙家栋（佟大为 饰）：以无数次的试验失败为切入点，展现其代表的中国科学家永不言弃的探索精神。
虽然他心里知道这事实，但被小苞谷这么坦率真诚地说出来，听在耳内还是很不舒服。
是一部带有强烈悬疑色彩的剧集，被称作「律政惊悚剧」。该剧由《实习医生格蕾》（Grey’s Anatomy）和《丑闻》（Scandal）的制片人Shonda Rhimes及其制片公司Shondaland策划，这是该公司今年卖出的第四个新项目（同时也是该公司第二部以黑人女性为头号主角的剧集）。故事描述一群满怀抱负的法学院学生和神秘的犯罪辩护学教授Annalise DeWitt（Viola Davis）卷入一场谋杀阴谋，导致他们所有人的生活被彻底改变。DeWitt不仅教学，还是一位著名的刑事案件诉讼律师。她聪明、热情、迷人、有创意，在法庭上和课堂里均冷酷无情。她很善于操纵别人，特别是她的学生。她亲自挑选了几名最优秀的学生到自己的事务所打工。她与一位心理学教授结了婚，但却保持着一段绝不能让第三人知道的婚外情。
萧炎初入中州奇遇不断，实力一路高进。为寻找药老昔日挚友风闲，萧炎独闯四方阁大会脱颖而出震惊全场，风闲许诺定会全力协助萧炎营救药老。冰河谷垂涎厄难毒体疯狂追捕小医仙，萧炎怒歼对手双方结下不解之仇。冰河谷怀恨在心勾结魂殿大肆围攻萧炎，危急关头萧薰儿破空现身强势出手，携古族之威雷霆退敌，两人互诉衷肠后不舍暂别。丹会如期召开，萧炎力压一众竞争者荣获冠军。不料丹塔异宝三千焱炎火意外失控，萧炎力挽狂澜挫败魂殿计划，惊险降服火灵再添一大助力。药老被魂殿暗中转移至亡魂山分殿囚禁，萧炎不惧强敌立即集结人马抢攻，数轮恶斗后终于成功救出药老，师徒再度相聚但萧炎却付出巨大代价仅存一线生机。
韩午阳和女友非常相爱、即将结婚，却没想到女友在他眼前因车祸爆炸身亡。
十二星相中的老大鼠，便是这个魏无牙。
北京猿人头盖骨的发现震惊世界，也引起了日本侵略者的觊觎，他们制定了抢夺计划,准备将其据为己有。为此中美两国商议制定了秘密转移计划，代号：军刀。爱国医生刘云翔的父亲在行动中不幸遇害并被诬陷为监守自盗，为替父雪耻，找到真凶，刘云翔误打误撞进入了军刀行动中。日军的凶残和贪得无厌令刘云翔厌恶万分，共产党员为保护国宝而英勇献身的壮举让他充满敬意。在北平地下党的帮助下，刘云翔最终完成了从自发替父报仇到自觉地用生命保护国宝的转变，并凭着他过人的智慧和勇气，粉碎了日军妄图掠夺我国宝的阴谋。他也在血与火的斗争中光荣地成为了共产党员并收获了自己幸福的爱情。
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郑氏及时制止他，道：你别乱教他
于是，这本该灭绝的王朝开始了一场新的混乱……
他这才想起来一个关键性问题——自己不会骑马。
物欲横流的时代，人们该如何面对曾经弥足珍贵的亲情、友情与爱情……
马莱伊不情愿地嫁给了拥有一栋新房子的朗·维萨恩,却没有意识到他是同性恋。这是爱情悲剧故事的开始。
Public Memento createMemento () {
《上道》是由捷成世纪文化产业集团有限公司、捷成瑞吉祥影视传媒有限公司、捷成星纪元影视文化传媒有限公司出品，向佐、贡米、唐晓天、洪浚嘉、涂黎曼、张南主演的科幻剧。
The "Regulations" are characterized by a wide range of uses and no strict restrictions on the status of the formulation and promulgation agencies. The matters and problems involved are not as important as those in the regulations, and the scope is relatively narrow. The content is detailed and specific, with strong pertinence; Generally, it is not only an "independent" normative document, It can also be a "supplementary" normative document (the content is to supplement the content of other normative documents according to law or authorization, and to refine and perfect them), It can also be "implemented" normative documents (it is directly formulated for the effective implementation of other normative documents, and does not create new rules by itself, but only makes specific provisions on the circumstances under which these documents are applicable, and makes detailed explanations on relevant concepts and issues). However, judging from the actual usage, the regulations are more suitable as "independent" and "supplementary" normative documents.
