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儿子想通了。这里曾是春秋时越国的都城，昔年越王勾践就是在这里卧薪尝胆，反愤图强一雪前耻灭掉了越国。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　 此时，一位经验丰富的国际刑警Lee已经对O进行了5年以上的追踪。正是Lee揭露了奥运会神枪手Lok Gan Wah和他年轻的弟弟Lok Tai Wah患上大脑疾病而在比赛失利的事件。这两位神枪手在失去金牌后神秘地消失故事以陕北榆林为背景，讲述陕北女青年沈美溪由于家庭贫寒，未能如期进入高等学府深造，在一家酒店打工，她的纯洁善良，深深打动了祖籍榆林的海归青年江涛。故事通过沈、江爱恋之情，展现了纯洁、善良、仁厚、包容的陕北女子的人性品格，以及沈美溪在复杂的家庭社会背景下所遭受的无奈和尴尬，但最终实现“有情人终成眷属”的良好愿望，揭示了爱情和幸福的真谛。她握住葫芦的手，笑眯了双眼，痴痴地望着那张略显粗糙的脸颊，喃喃道：我好想你。李敬文也回来了，听了这事，悄声对小葱道：山芋要是发挥正常，没准就能中举。