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《英雄》的主要演员是一群实力派演员。扮演燕双鹰的张子健，扮演大莲的王昌娥和扮演沈七七的胡晓光，都毕业于北京电影学院。这些演员在表演上分寸感把握得特别好，都很会控制自己，把剧中人物神秘、超乎常人的特点发挥得淋漓尽致。Liskov Substitution Principle, LSP (Richter Substitution Principle) means that subclasses must replace their parent types. In other words, in the process of software development, after the subclass replaces the parent class, the behavior of the program is the same. Only when the subclass replaces the parent class and the function of the software is not affected can the parent class be truly reused, and the subclass can also add new behaviors to the parent class. In order to look at an example of violation of LSP principles, the specific code is as follows:　　在她们努力保持团结并维护友谊的同时，电话公司的员工将在女性已经获得投票权和公职权的情况下继续她们的女权主义斗争。不过一转念陈余便放弃了这样的想法。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.