The Liskov Substitution Principle (LSP) is one of the basic principles of object-oriented design. The Richter substitution principle says that wherever a base class can appear, subclasses can certainly appear. LSP is the cornerstone of inheritance reuse. Only when derivative classes can replace base classes and the functions of software units are not affected can base classes be truly reused, and derivative classes can also add new behaviors to base classes. The Richter substitution principle is a supplement to the "open-close" principle. The key step to realize the "open-close" principle is abstraction. The inheritance relationship between the base class and the subclass is the concrete realization of abstraction, so the Richter substitution principle is the specification of the concrete steps to realize abstraction. --From Baidu
When grandpa came to play, he was angry with grandpa: "why did you go there then? Why didn't you join the red army? If you had joined the army in those days, would my family be like this?"
Rare pearl
At present, the biggest criticism of deliberate practice is that Erickson's evidence of deliberate practice mostly comes from activities with lower "cognitive complexity", such as chess, piano, basketball, taxi driving and spelling, but it has limited effect on activities with higher "cognitive complexity", such as sales and management. How to become an excellent sales or CEO through deliberate practice, and where to start? How? Practice what? The difference between learning activities with high cognitive complexity and low cognitive complexity is largely manifested in the amount and proportion of tacit knowledge. Tacit knowledge needs to be found in situations.
《一飞冲天》是一档，具鲜明湖北地域文化内涵的智力秀节目。以选手攻、守擂为基本形式，进行九人间的答题游戏。通过期赛、季冠军赛，专场对抗赛等形式，决选出全武汉最具知识，最具智慧的答题高手。
Public abstract class AbstractHandler {
香荽带着两个妹妹跟绣娘学女红，也读书练琴。
不管此番能够成功，自己失去了一位能征善战的大元帅都是一个不争的事实……希望情况不要再继续恶化，要是失去的太多当真不敢想想后果会有多么严重……韩信终究不是自己人，此番应该是他自己的个人行为吧？刘邦想想尹旭操纵韩信的可能性还是很小的……从最近一系列的动作来看，韩信绝对不是一个善茬，只要有了实力，他不会轻易臣服于任何一个人。
女记者欧阳兰和未婚夫坂野正南结婚在即，突然接到任务，帮助归国华侨寻找六十年前在太行山参加八路的女战士思源。当年在太行山参加过战争的随军老记者穆易告诉欧阳兰，思源很像当年在太行山做随军记者时见过的一个叫培蕊的女兵。于是，一段围绕着培蕊和跟她有关的故事在欧阳兰的追踪下，一点点清晰起来：培蕊和李营长之间的爱情、铜家峡惨案、花儿、黑妹子……无数个感人至深的故事让欧阳兰的内心不断翻腾。然而，一只“绣袜”却让欧阳兰震惊的发现，坂野正男的父亲正是当年制造铜家峡惨案的“杀人挺进队”的成员。正当欧阳兰陷入痛苦的矛盾中时，坂野正男却带着父亲的嘱托来到太行山，以实际行动表达了他们对当年的愧疚和对中国的友谊。
2. Civilian players may not be able to break the defense of local tyrants in the later period. Because the attribute income is linear and does not decrease, when someone smashes a huge amount of resources to pile up the defense, low-percentage characters such as Blowing Snow will be the first to hit single-digit damage.
导演：祝东宁《唐砖》《致我们暖暖的小时光》《恋爱那点事儿》
Select the appropriate system.
《地下特工 Jean-Claude Van Johnson》看剧名就知道男主角就是动作巨星Jean-Claude Van Damme。他本次复出主演的是一部动作喜剧，他將扮演Jean-Claude Van Johnson，一个伪装成建筑承包商的特工。Kat Foster则扮演他一直放不下的前女友，因任务再次相见。主角想在完成任务的情况下再次赢取她的芳心。
With DFU, the system will be purer.
Syfy宣布剧集《#凡妮莎海辛# Van Helsing》续订第五兼最终季，13集最终季将于明年初开机拍摄，预定同年播出。
1. Competition Rules: Taking the community as the unit, each community must have three groups of residents to participate, each group of three people, requiring at least one female athlete from each group.
《机械姬 Ex Machina》及《湮灭 Annihilation》的导演Alex Garland宣布为Hulu制作剧集《开发者 Devs》并获得预订，这部8集限定剧将由Alex Garland编写剧本及执导，剧中讲述一个年轻电脑工程师Lily于旧金山的顶尖科技公司工作，她 决心调查雇主的秘密开发部门，因为Lily认为这与男友的失踪有所关联。 Sonoya Mizuno﹑Nick Offerman﹑Jin Ha﹑Zach Grenier﹑ Stephen McKinley Henderson﹑Cailee Spaeny及Alison Pill皆加盟剧组，水野索诺亚/ Sonoya Mizuno饰演女主Lily﹑Nick Offerman饰演Amaya的CEO Forest，对公司秘密开发部门有所痴迷﹑Jin Ha饰演一个天才网络安全专家，女主前男友。 Zach Grenier饰演Kenton，Amaya的安保主管﹑Stephen McKinley Henderson饰演Amaya秘密开发部门的其中一名顶尖技术人员Stewart﹑Cailee Spaeny饰演Amaya秘密开发部门的员工Lyndon，年轻聪明的她有点固执﹑Alison Pill饰演Amaya二把手Katie，受Forest提携的量子物理学家。
General Shi Lang Memorial Hall, Zhenhai Palace, Longquan Palace, Daogong Palace and Beacon Tower on Yandun Mountain are shaded by cultural and natural places of interest. During the Japanese invasion in the Ming Dynasty, this was once the forefront of the fight against Japanese pirates. In order to reunify the motherland in the early Qing Dynasty, Shi Lang used to herd horses and train soldiers here. Now it is a famous hometown of overseas Chinese in the country, with pure customs and beautiful human feelings. It is a tourist attraction and a cradle for overseas Chinese to seek their roots and pay homage to their ancestors in Taiwan, Hong Kong and Macao.
String str= "Hello, World";
