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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女记者欧阳兰和未婚夫坂野正南结婚在即，突然接到任务，帮助归国华侨寻找六十年前在太行山参加八路的女战士思源。当年在太行山参加过战争的随军老记者穆易告诉欧阳兰，思源很像当年在太行山做随军记者时见过的一个叫培蕊的女兵。于是，一段围绕着培蕊和跟她有关的故事在欧阳兰的追踪下，一点点清晰起来：培蕊和李营长之间的爱情、铜家峡惨案、花儿、黑妹子……无数个感人至深的故事让欧阳兰的内心不断翻腾。然而，一只“绣袜”却让欧阳兰震惊的发现，坂野正男的父亲正是当年制造铜家峡惨案的“杀人挺进队”的成员。正当欧阳兰陷入痛苦的矛盾中时，坂野正男却带着父亲的嘱托来到太行山，以实际行动表达了他们对当年的愧疚和对中国的友谊。改编自KarenM.McManus的畅销小说,讲述五个学生一起被留堂,却只有四个人活着走出教室,预告中的画外音讲述者Simon死去了,另外四个人中有一个人引发了Simon的死,而没有一个人是完全无辜的。I'm finally going to have a third attack!该剧讲述了离家各过各的生活的四兄妹在突然某一天同时回到家中而展开的故事。
吴凌珑有气无力地扶着门，神色绝望。　　宝琳娜进入了宝欧拉的丈夫家---一个逐渐衰败的布兰楚家族。宝琳娜为了减轻自己的罪恶感，她试着改变布兰楚家人的生活。