Is to define a main method calculate in the AbstractCalculator class, calculate () calls spilt (), etc. Plus and Minus inherit the AbstractCalculator class respectively, and implement the call to subclasses through the call to AbstractCalculator, see the following example:
这天，周青正在悟道修炼，突然一幅有山有水，有大河湖海，有连绵宫殿，仿佛一个真实世界的图画笼罩住他。
Liang's husband came home and found the victim lying in the kitchen and called the police for help.
根据叶非夜的小说《傲娇男神住我家》改编
为了摆脱困境，寻找创作灵感，孟凡来到了这个“荒村客栈”，客栈主人欧阳接待了孟凡，并且把孟凡带到了一间充满神秘色彩的客房。在这个房间里，有张传说中的明朝的老床，那是传说中胭脂睡过的床。于是，在这个古老怪异的客栈，奇怪的事情接踵而至，胭脂的吟唱常常在夜晚回荡、身着明朝衣服的奇怪女人常常在街角一晃而过，孟凡越来越觉得自己跳进了一张早就铺开的网，梦魇、陷阱、阴谋正一步步向他逼近……
故事讲述一支由精英组成的海豹突击队的日常生活，以及在前线上他们是如何训练以及计划和执行国家委派给他们最危险的，高风险的任务。他们时刻准备着执行在世界各地的秘密任务，而只有那么片刻的时间，他们通过长途电话费才能与自己的家人保持着联系。即使面对毫无胜算的情况下，这个所谓严密的海豹突击队的成员们依旧表现出他们坚定的爱国主义和无畏的奉献。David Boreanaz扮演为人专注、广受尊重的突击队指挥官Jason，他已经执行了十多次最危险的突击任务，身心均受到过伤害。Neil Brown Jr.扮演Jason的突击队中资历最老的成员Ray，是Jason最忠实的战友和最值得信赖的朋友。Max Thieriot扮演Jason的突击队中的成员Clay，是千禧年一代。他很有能力，但他的自信和傲慢只是为了隐藏内心深处的不安全感。A.J. Buckley扮演强悍的战士Sonny，他的内心一直在和自毁倾向做斗争。他就像个炸药桶，随时都可能爆炸，但他对Jason及其团队一直忠心耿耿。Toni Trucks扮演后勤官员Diaz，负责为Jason及其团队准备各种物资装备。Jessica Paré扮演聪明的中情局分析师Mandy，致力于扫除世间一切邪恶，消灭一切坏人。
With the popular rapid iteration, the way of product planning and design one year in advance is no longer feasible, because the plan cannot keep up with the changes. In March and April of the following year, in the face of the new market trend, production simply did not have time to respond.
陈重和赵悦结婚七年了，赵悦依然不倦地从生活的各个细节求证婚姻的安全程度，她需要的是细致的关心和绝对的忠贞。但陈重渴望的仍是火一样的爱情，就好像他大学毕业时为了赵悦从北京一路追到成都，放弃了父母和前途。
传旨太监十月二十日到达眉山县，黎章还来不及高兴，就被一个消息惊得面色煞白：皇帝将宁静郡主赐婚白虎将军。
由于家庭变故，Sataya和母亲不得不背井离乡来到城市投靠母亲的好友。新生活开始了，Sataya这个来自乡村的直男与从小娇生惯养的城市千金Rak之间将会发生怎样的故事呢？其实这是一个小青梅与小竹马的故事。他们互相扶持，互相帮助，不离不弃，直到永远。
霸王，和谈完全就是个骗局，刘邦现在背信弃义。
开始了全面对临江国的战争，这也是此战的核心和最为关键的地方。
血手杜杀，笑里藏刀哈哈儿，不男不女屠娇娇，不吃人头李大嘴，半人半鬼阴九幽，昆仑七剑口中的五大恶人已然出现。
武装，以压到一切敌人的英雄气概，在蒙阴孟良崮一举全歼蒋军整编74师，击毙师长张灵甫。孟良崮战役的胜利，是我华东军民同仇敌忾，万众一心，粉碎蒋军对山东重点进攻的伟大胜利。“百万军中取上将首级”是我军军事指挥艺术的奇迹与创举，是我华东军民共民同谱写的悲壮的大历史篇章！在孟良崮战役中英勇牺牲的革命先烈们永垂不朽！
Since the 1920s, the influx of Western journalists into China has been like crucian carp crossing the river, but as far as the social status at that time is concerned, no one can expect Aban to match it. Aban is naturally competitive and can't compete for emergencies in the front line, but his real advantage lies in his extensive upper-level relations. The top level of the Chinese government and the top level of Japan, the United States, Britain, the Soviet Union and other countries in China are full of his personal friends. At the beginning, the national government wanted to expel him from the country, but later, all four families took him as their guest of honor. Japan attaches more importance to the fact that the top leaders of various factions and departments in civil and military affairs are eager to break through his threshold. The Soviet Union was also interesting. While setting off a wave of criticism of Aban, it sent an ambassador to talk with him in secret and entrusted him with conveying high-level meanings. As for the United States and Britain, it goes without saying. The importance of Aban lies in the fact that his role has completely gone beyond that of a mere reporter. To the U.S. Government, he is an unpaid senior intelligence agent, providing top secret information free of charge, weighing more than any official spy. To the rest of the governments, he is a supernumerary U.S. Diplomat, and his role is often beyond the reach of U.S. Ambassadors. Therefore, between Japan and the United States, between China and the United States, and between the United States and the United States, he has to send messages frequently. As for the infighting among various countries, they should also reveal their secrets to him so that they can be published in the New York Times and confuse each other. For example, before Japan officially joined the Axis, because of the confrontation between the two factions at the highest level, some people secretly told each other the news, which made him get a global super scoop for no reason. All this, of course, depends on the golden signboard of the New York Times and its inexhaustible resources.
9-7 Administrators: Administrators are special users. Write a class named Admin that inherits the User class you wrote to complete Exercise 9-3 or Exercise 9-5. Add an attribute named privileges to store a list of strings such as "can add post", "can delete post", "can ban user", and so on. Write a method called show_privileges () that displays the administrator's permissions. Create an Admin instance and call this method. ?
全能的神确实存在，并且居于布鲁塞尔寻常住宅？还用电脑掌管一切生命？《小英雄杜杜》鬼才导演继《小国民尼谟》后又一奇幻狂放之作，这次斗胆玩转宗教。原来神不只有独生子道成肉身，还有个反叛的十岁女儿，对人间种种不幸看不过眼，决定离家出走改造世界，推翻暴君父亲。先发短讯泄露天机公布大限，再化身小救主，下凡召集六大使徒，聆听各人心曲，开启《超新约全书》。暴怒的神也追到凡间，力阻女儿造反。天马行空出奇制胜，更有凯瑟琳·德纳芙演富婆使徒，与黑猩猩擦出爱火花。
开心女鬼郑裕玲，整蛊作怪、笑料百出！
一名年轻的网络黑客尼奥发现看似正常的现实世界实际上是由一个名为“矩阵”的计算机人工智能系统控制的，人们就象他放牧的动物一样。尼奥在网络上查找关于“矩阵”的一切。在一名神秘女郎特蕾妮的引导下见到了黑客组织的首领摩菲斯，三人一起走上了抗争“矩阵”的征途。
