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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.The following situation can definitely jam tank.“这里现在开始是伦理。”是以高中教伦理的男教师高柳为主人公的教师。高柳贴近学生内心的烦恼，一方面想要拯救学生的心，另一方面却表现出“只对烦恼的人感兴趣”这样自虐的样子，成为了简单地对男生原谅身体的女生、周围人看起来幼稚的秀才、与被欺负的孩子亲近的教师本片描绘了原被欺负的少年等，以独自的立场面对各种学生们所面临的问题的模样。Information Theory: I forget which publishing house it was. It is a very thin book and it is very good. There is a good talk about the measurement of information, the understanding of entropy and the Markov process (there is no such thing in the company now, I'll go back and find it and make it up). Mastering this knowledge, it is good for you to understand the cross entropy and relative entropy, which look similar but easy to confuse. At least you know why many machine learning algorithms like to use cross entropy as cost function ~果真是啊，现在北方诸侯可以说全部牵连到了其中……齐国之地可是风起云涌，战火不断啊。