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B) Design principles. Many people have listed seven principles, such as single duty principle, opening and closing principle, Richter substitution principle, dependence inversion principle, interface isolation principle, composite reuse principle and Dimit principle. LSP, I elevated it to one of the three cornerstones of the object-oriented paradigm; Single responsibility and interface isolation are mainly used as the principle of responsibility division in object-oriented analysis/OOA, which you can not pay much attention to at this time. Relying on the inversion principle, I throw it away as garbage, because the opening and closing principle or directly "relying on abstract type principle" already contains the essence of relying on the inversion principle, while the dross of relying on the inversion principle is inherited by IoC. Of course, the pullback, I emphasize very much. Therefore, you need to master the abstract dependency principle (OCP), one-way dependency principle (including the learning of callbacks) and the minimum dependency principle (composite reuse principle, Dimit rule).都暻秀（EXO D.O.）在戏中饰演男主人公金焕东(音译)，是一位准备制作毕业电影的电影本科大学生，故事以他为实现导演梦及与前恋人慧晶（蔡书珍 饰）再次相遇后的故事为主，向青年们传达即使身处逆境，也不要放弃希望，勇往直前的正能量。3. We can also manually specify the starting position of the node, which does not mean that we have to start from the actual node.姊妹俩说笑间，绿菠见这边窗根底下有一大块空旷的地方，便问道：这里没有花草，也没种些竹子？她那边窗外有竹子。MDT Meeting Site EnvironmentWhat is the real demand of parents for the cultivation of their children's thinking ability at this stage?