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前四的名将，足可见李牧的厉害之处。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.After completing the practical activities, everyone gathered together for lunch, exchanged what they had gained from the practical activities, and talked about what they thought were the shortcomings of the practical activities. We all talked freely about our own experiences. After returning to school, we took a group photo again in front of the public health building. Although we were already very tired, everyone had a confident and satisfied smile on his face.Is there a simpler way?Macro commands are a set of commands. By executing macro commands, one batch of commands can be executed at a time.R1 + button: Make the enemy faint.一部有着大大小小的秘密的，17岁左右青少年的成长喜剧青涩故事。