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刑部侍郎张杨接信后，被轰去魂魄，立即向朝廷报了丁忧，回乡奔丧，要为父守孝三年（实为二十七个月）。5. Finally, you can see two WeChat application icons on the desktop of your mobile phone. You can log in to two WeChat accounts by opening the two WeChat applications at the same time.……二曰承影，味爽之交，日夕昏有之际，北面察之，淡炎焉若有物存，莫有其状。长大的龙小云被招为相爷的乘龙快婿，但成亲当晚，相府千金离奇死于小李飞刀之下，龙小云被卷入其中，李寻欢义无反顾，重出江湖，访查真凶，但却仍被小云误解怨恨。在与冷月宫宫主江怜月的争斗中，李寻欢得到关天翔的相助，关甚至不惜为救小云失去武功，李寻欢感激之余，以为知己，两人结为兄弟。尾随而来的却是起伏不定的江湖风波。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