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Set the position and quantity.用巴掌制伏一个女人，庞取义做到了。The Liskov Substitution Principle (LSP) is one of the basic principles of object-oriented design. The Richter substitution principle says that wherever a base class can appear, subclasses can certainly appear. LSP is the cornerstone of inheritance reuse. Only when derivative classes can replace base classes and the functions of software units are not affected can base classes be truly reused, and derivative classes can also add new behaviors to base classes. The Richter substitution principle is a supplement to the "open-close" principle. The key step to realize the "open-close" principle is abstraction. The inheritance relationship between the base class and the subclass is the concrete realization of abstraction, so the Richter substitution principle is the specification of the concrete steps to realize abstraction. --From Baidu音乐厅中传来枪声，观众们一片惊慌。一位外国女子（露西•曼娜海姆饰）询问理查德•汉内（罗伯特•多纳特饰）是否可以在他家中过夜。次日该女子在被杀之前告诉理查德必须阻止间谍组织“三十九级台阶”将国家机密偷偷送出英国。汉内为了证明自己并不是杀人凶手无奈前往苏格兰高地寻找线索，在火车上他寻求一位叫做帕梅拉（玛德琳•卡罗尔饰）的金发年轻女子帮助，但她却马上向警察告发了他。他找到了“三十九级台阶”的领导人乔丹教授，但随即被陷害入狱。侥幸逃脱后又由于帕梅拉的告发被两位伪装成便衣警察的人带走，并且他们还把帕梅拉和他铐在了一起。于是两人携手逃脱了出来并取得了互相的信任，然后他们再次回到音乐厅，汉内看到了上次就见过的表演。他向号称可以回答任何问题的“记忆先生”（怀特•沃森饰）提问：“什么是三十九级台阶“，于是……黄豆大声问道：姑父，你咋刚刚好今儿到家哩？张槐笑道：自然是急急忙忙地赶回来，好跟你们一块过节。