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　　就这样，安迪苍白的生命里突然多出了一个活蹦乱跳古灵精怪的孩子，不仅如此，他还对艾罗尔学校的美丽女教师一见钟情。完全不懂得如何管教孩子的安迪和人小鬼大的艾罗尔，这样一对“奇葩”的组合之间会擦出怎样的火花呢？离开吧。Reviser: Xue Yaqin　　话说从第一部追到现在观众们，大多都已经和Focker先生一样从年TelecommunicationsThe 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对于情爱和婚姻，她有自己的看法。