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看见他们出来，从石窟中涌出一群人，有猎户，有挑脚汉，有农夫等，打扮形形色色。这是一个关于成长的故事。每一个人都曾经经历过少年青春的年头，那时候的种种第一次都是生命成长的轨迹，刻画出青春的激情、好奇、欢乐……当然也有苦恼和泪水。在那一段淡然流逝的青葱岁月里，如果没有朋友温热的笑声、老师温柔的关爱、亲人温馨的照顾，我们就真的成了名副其实的孤男和寡女。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 BaiduResults:当然了下一步的谋划也在进行之中，毕竟处在这样一个时代之中，如何扩展实力和国土。刚才的素姑娘长相就不用说了，但她身上缺少一种精气神，我就不细说了——便是背后，议论人短长也是不好的，况且她病得那样，更不好说她。有谁敢利用一个致命的疾病去对付在六岁病童体内的另一个疾病？结果出人意料。