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希什（威尔•史密斯 Will Smith 饰）十分准确的把握了男性的弱点：他们在求爱的时候由于过分迫切想得到对方好感，反而会表现笨拙失去魅力。而希什掌握了一套完整的独家的理论，可以帮助男士在头三次约会时候就成功俘获对方的心，这套谋略全面实用，令约会期间的就餐、牵手、接吻，有了指导细则。Run the test code in TestSpring again. The code has not changed, but log information is output before and after the business method runs:Enumeration < Observer > enumo = vector. Elements ();Then the player can get the corresponding crystal fragments through the mailbox.张槐跟郑氏对视一眼，均看出对方眼中的怒气——两下里一对照，这黄家存的啥心事就很清楚了。Liskov Substitution Principle, LSP (Richter Substitution Principle) means that subclasses must replace their parent types. In other words, in the process of software development, after the subclass replaces the parent class, the behavior of the program is the same. Only when the subclass replaces the parent class and the function of the software is not affected can the parent class be truly reused, and the subclass can also add new behaviors to the parent class. In order to look at an example of violation of LSP principles, the specific code is as follows:貌夺天下的师大校花林卓被三个男同学颜效锋、邱天虹、王奇穷追猛打，她却在毕业前夕神秘失踪。20年后，颜效锋荣升省文化厅长，邱天虹成了地产富商，王奇也在重点中学任要职，三个男人各个事业有成。当听到林卓香销玉殒的噩耗，她的女儿林朵儿带着复仇之心闯入同学聚会现场来找爸爸——原来朵儿竟是私生女……