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Module usually refers to the code organization mechanism provided by programming language, which can be used to disassemble programs into independent and universal code units. The so-called modularization mainly solves many aspects such as code segmentation, scope isolation, dependency management between modules, and automatic packaging and processing when released to the production environment.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.Regulations on the Supervision of the Use of Medical Security FundsAs a person who knew crayfish very well from an early age, I also lost money because I was too confident and thought I was smarter than others. Therefore, novices must be careful when entering. They should not think it is easy to raise crayfish and think it is easy to earn money.所以你不要找我和陈洋比，你和那些不帅的人比一下，你就会发现，其实你还是蛮帅的。　　阿喜最钟爱是一种叫做勿忘我的“草根”植物，代表了他对喜爱的人的牵挂。阿喜为送好友阿杰要出城工作，想送“勿忘我”给阿杰，因而走失。/boggle (hesitation)