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陆小婷（张延饰）是一个青春亮丽的芭蕾新星，对爱情充满浪漫憧憬。在一次主演舞剧《天鹅湖》时，与即将大学毕业的丁亚刚（姜武饰）邂逅，两人执着而热烈地相爱了，并偷偷地结婚。丁亚刚悲痛自责，答应照顾小菊一辈子，并携小菊回到了东北林场，简朴而清贫地生活在一起。 　　此时小婷已身怀有孕，孤身一人来到丈夫生活过的城市深圳，并生下儿子小强。正当小婷在南方只身奋斗时，丁亚刚在北方赖以生存的林场也被山火吞噬，而他与小婷的儿子又不幸患上了肾衰竭，为此故人不期而遇，爱恨交织…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 BaiduEpisode 25他绝对不会容许这种情况出现，若是有不长眼的触了霉头，定会以雷霆手段绞杀。但是现在他没有任何办法，蒯彻利用其成像职权的便利，进入王宫成功行事。他心中不甘，堆上一脸笑容，提醒赵锋道：将军，德胜路那家铺子只卖羊肉。自己领着百人前来支援，这逻辑上实在说不过去。