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However, the sharp increase in express delivery has produced a large number of discarded packages, which is not a unique phenomenon in China. How do other countries solve the problems brought about by these discarded express packages? Li Li told reporters: "Germany promulgated the Packaging Waste Management Law in 1991, so Japan also has a special Packaging Waste Recycling Law, which stipulates that different packaging wastes should be recycled separately."Chapter 30胡氏颤颤接过大刀，一介妇人哪里下得了这个手？再者，胡宗宪当权以来，将自己与汪滶接来杭州好生伺候，即便汪直身死也尽量照顾，她真的下不去手。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他没骗我吧？葫芦听了一怔，看向板栗，那少年一边朗声大笑，一边挥舞着手臂，跟赵锋比划刚才的战斗情形。Two years ago, family changes and bad marriage caused Mary to have a mild depressive reaction. But on the surface, Mary is more "happy" than before. "I just try my best to feel that I am very good and cannot let others know." Mary said. She covered up everything with a smile or positive energy expression, but her inner depression snowballed until the night two years later, when it completely collapsed.