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Market Insight (STEP 3): Closing the performance gap can be achieved by strengthening the implementation of the strategy, while closing the opportunity gap requires new business design. However, the new business design needs to take market opportunities and customer needs as inputs. Market insight is to explore opportunities to achieve future strategic goals.　即将大四毕业的林之校（杨紫 饰）在毕业前夕跌落人生谷底，父亲患癌住院，不得已放弃外地的名企工作机会，和男朋友分手。所有对于爱情和未来生活的美好想象都在这一刻破灭，恰好这时，父亲的主治医生顾魏（肖战 饰）走进了林之校的生活。。。于是，他对胡钧道：林指挥使说的有道理，不如让林火长自己说，看他愿意跟谁。书儿却脸上放光起来，声音脆快地把小葱几人的建议说了，还从袖子里扯出一张卷着的纸筒儿，喜滋滋地递给少爷看。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 Baidu5 成人考试