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Industrial Revolution 1.0-Age of Steam: It began in Britain in the 1860s, with the invention and application of steam engine as the main symbol. Human society entered "Age of Steam". Human society changed from agricultural handicraft industry to a mode of economic development driven by industry and mechanical manufacturing.二十四节气的每一刻都蕴藏中国人洞察天地的智慧，蕴含着生存智慧与生活哲学。是先人立身处世的生活方式，是与自然天人合一的精神追求，是中华民族极具个性的科学和文化遗产。2020年先通过“冬春季”跟大家共同探寻“节气之美”，感悟传统文化的别样生命力。每个节气，邀请不同领域的文化名人前往带有不同节气意境的匠人居所体验其家庭的生活状态，展现当地的独特节气风貌。邀你“住进节气里”，零距离地体验每个节气中的优雅生活。通过节日复兴带动中式美学的复兴。For interface programming, a lot of changes that may occur in the system in the future can be isolated. Why? If the code is written for an interface, he can implement the interface with any new class through polymorphism. However, when the code uses a large number of specific classes, once new specific classes are added, the code must be changed. Violating the opening and closing principle.笑闹声中，就听有人道：瞧，那是葫芦的媳妇儿。《声临其境第2季》是由湖南卫视播出的原创声音魅力竞演秀，由王凯担任主持人，张国立、张铁林、王刚担任点评嘉宾。节目以台词和配音为切入点，每期邀请四组台词功底深厚或是声音动听的演员同台竞声，通过台词功底、配音实力和互动搭档的比拼，不见其人，只闻其声，纯声较量。节目每期设置“经典之声”、“魔力之声”和“声音大秀”三个环节，竞演嘉宾呈现的配音片段包括近年热播的仙侠奇幻剧、经典好莱坞商业片，动画片乃至人气网络游戏。As online organizations have broken the time and geographical restrictions, they have saved the time and transportation costs that parents and children have to pay. Secondly, it has the natural advantage of directly facing the national market and allocating the national teacher resources, breaking the regional restrictions on obtaining customers and employing teachers. In addition, in the process of scale-up, online organizations do not need to invest in the training of stores and store managers, so the upfront investment is relatively low.