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In essence, classification is to find the common points and differences of things in our thoughts. It is the basic method and ability for us to know and understand the world. On the basis of classification, it is possible to judge and reason, and to form concepts and make decisions. Classification requires comprehensive demonstration activities such as association, analogy, reasoning and extension, and is the basic cell of thinking.庞取义心头一紧：哪里的军情？他说不清楚。Some media once described Zhu Bin as a "big fellow who loves to touch socks". He also had several golden sentences circulating: "Wearing cotton socks or nylon socks can reflect a person's quality of life." "If you think the socks are not good, you can smell them yourself."Right-click this PC-> Properties-> Advanced system settings-> Environment Variables...本片讲述21世纪初期，美国爆发内战，独裁政权推翻民主制度，自号国会监察。各义士奋起抗暴，全国烽烟四起，各地更严密实施军管。唯一的自由城市钢港，市内龙蛇混杂。火凤凰在此经营酒巴，兼职捕快与一批抗暴分子并肩全战。艾素是一名自由战士，与火凤凰曾有过一段恋情，帮助女科学家戴博士逃离华盛顿，并与她一起逃到钢港，在走投无路之下求助火凤凰，相处之下二人发生微妙的感情。Factory Pattern: Factory Pattern is a frequently used pattern. Classes implemented according to Factory Pattern can generate instances of one of a group of classes according to the provided data. Usually, this group of classes has a common abstract parent class and implements the same methods, but these methods perform different operations for different data. First of all, we need to define a base class. Subclasses of this class implement methods in the base class through different methods. Then you need to define a factory class that can generate different subclass instances according to conditions. After getting an instance of a subclass, developers can call methods in the base class regardless of which subclass instance is returned.两千一百八十年前，西汉王朝的孝文帝刘恒崇尚勤政节俭、以仁德治天下。在他执政的二十三年中，对内，废除自商周以来施行的黥字、剁脚等残酷肉刑，废关传，鼓励农耕，发展人口，是历代封建王朝中第一个在全国全免田租的皇帝；对外，一面坚持与匈奴和亲，一面屯垦戍边、强边固土，他与继承他帝业的儿子刘启统治的时期，被后人称为文景之治或文景盛世。文景之治为汉武帝刘彻走向鼎盛强大奠定了雄厚的基础。