The principle of opening and closing means opening to expansion and closing to modification. When the program needs to be expanded, the original code cannot be modified, but the original code should be expanded to achieve a hot plug effect. Therefore, a summary of one sentence is: in order to make the program scalable, easy to maintain and upgrade. To achieve this effect, we need to use interfaces and abstract classes, etc. We will mention this point in the later specific design.
和红军将领以及苏区群众的感召下，他毅然放弃美国优越的生活，留在延安参加中国的抗日战争。他曾经有三个梦想，第一个梦想是娶了中国妻子苏菲；第二个梦想是中国的抗日战争取得伟大的胜利；第三个梦想是成为一个完全的中国人。在经历了十四年的艰苦奋斗，马海德由一个自由主义者变成一位坚定的马克思主义者，他1937年加入中国共产党，参加过红军、八路军和解放军，长期战斗在我军的卫生战线，和白求恩、柯棣华等国际主义战士一同，为中国革命做出了伟大的贡献。他不但实现了三个梦想，新中国成立后，他新的梦想是为中国性病和麻疯病的彻底根除而努力奋斗。
观众将进一步了解Mike Ehrmantraut（Jonathan Banks）的个人生活。当费城侦探跑来向他质询一起双重谋杀案时，他被迫雇用Jimmy做自己的法律顾问。这起谋杀案是真实的，Mike当年为了复仇在费城杀死了两名警察，但他绝不是恶意杀人。Mike将发生一些显著的变化，但那些变化起源于小事情。
几乎代表了武侠小说、网络小说的最高水准。
Suggest refinement
奔忙在都市森林中的蚁族白领郭羽，为了保护自己心爱的姑娘朱慧如，无意间卷入了一场杀人案，成为凶案嫌犯。原本死水般的庸碌生活被瞬间打破，在警方和黑帮的双重追查下，求生的本能使人性在危机中慢慢发酵出危险的味道。
First of all, I would like to thank Jiguo Net very much for giving me the opportunity to experience AnchorChef's low-temperature slow cooking machine. After two days of trial, I have made hot spring eggs, sirloin steak and lamb chops. I have basically become familiar with the operation method of the slow cooking machine and accumulated some experience in use. I would like to make a brief introduction and share my own experience. This report is divided into three parts. After a simple blueprint, let's officially enter the text.
[Depth] Who Is Affecting the Future of China's Crude Oil Futures Market?
Only amateur athletes are allowed to participate in the Olympic boxing matches, which are divided into 12 categories according to their weight: 48, 51, 54, 57, 60, 63.5, 67, 71, 81 and 91 kg or more.
游走在多名女性间的凉对于爱情早已麻木，却在遇见优子时，感受到了不同于以往的感觉，那是一种命定的吸引，而优子也不受控制的喜欢着凉。但两人的相恋却注定是一场悲剧，随着故事的发展，真相渐渐浮出水面，等待凉和优子的究竟是幸福的彼岸还是更深的深渊？
《雪花女神龙》讲述的是江湖女侠上官燕为寻找自己母亲踏上一条前途未卜的凶险历程。十五年前，８岁的上官燕家庭发生惨变，父亲为人所害，母亲下落不明；上官燕幸为武林奇人古天木救走并抚养成人，并传授其绝世剑术雪花神剑。十五年后，上官燕身负神兵“凤血剑”现身江湖，寻……
若是回来晚了，咱们把南雀国都给灭了，那时林兄弟挣不到功劳可别怪人。
However, we need to pay attention to the fact that Some "chains" are doomed not to contain "certain rules", just as some "checkpoints" are inherently unable to have certain functions. For example, "checkpoints A" are only responsible for attacking land enemies and have no air defense capability, while "checkpoints B" are only responsible for attacking air enemies and have no ability to defend infantry. "Checkpoints C" may be NB, which can defend both air defense and land enemies. "Checkpoints D" are the best and can defend both land and sea.
永平帝提在嗓子眼的心才沉了下去，大大地松了口气。
According to Quanzhou government records, Qingyuan Mountain was first developed in the Qin Dynasty. In the Tang Dynasty, "Confucianism, Taoism and Buddhism" competed for land occupation and management. It had traces of Islam, Manichaeism and Hinduism and gradually developed into a famous cultural mountain with various religions. The scenic spot is full of flowing springs and waterfalls, strange rocks and caves, green peaks and trees, The cultural landscape dominated by religious temples, temples, literati academies, stone treasures, stone carvings, stone structures, stone carvings and other cultural relics is found in almost every corner of Qingyuan Mountain. There are 7 and 9 large stone carvings of Taoism and Buddhism in the Song and Yuan Dynasties, nearly 600 cliff carvings in past dynasties, 3 granite wood-like Buddha chambers in the Yuan, Ming and Qing Dynasties, and the pagoda of modern eminent monk Master Hongyi (Li Shutong) and Master Guangqin.
《味库美食视频》是一档美食分享类节目，这里有海量菜谱，菜品智能搭配，主要满足年轻人想下厨房学做饭的需求，带你一起感受食物的力量和美好。
一位初入江湖，励志成为第一侠盗的天才少女——莫妍前来开封府，为蒙冤入狱的五师兄翻案。却因其敏锐的洞察力为包大人赏识，遁入公门成为开封府的女捕快，并与侠骨柔情的南侠展昭结为欢喜冤家。两人一路揭露层层阴谋，莫妍不仅揭开了自身身世之谜，也明白展昭心中“侠义”与“情感”的两难抉择......
At present, the progress of farmers in the society is the progress of the countryside. Improving the quality of farmers is the fundamental plan to realize the economic development, social progress and long-term stability in the countryside. Therefore, the work of popularizing education for all must be carried out attentively. The improvement and progress of the quality of the whole peasant team mainly depends on the progress and improvement of the young people. They are creative and full of vitality. They are representatives of the new rural productive forces and contain huge human resources. Stabilizing and strengthening agriculture and improving its comprehensive production potential require them to cultivate. To increase farmers' income and lead a rich and polite life, they need to explore. To strengthen the construction of democracy and legal system and spiritual courtesy at the grass-roots level in rural areas and to maintain rural stability, they need to play an attentive role. Therefore, the quality of the vast number of rural youth and whether their intentions and creativity can be brought into play are directly related to the smooth realization of the cross-century development goals of China's agriculture and rural areas.
