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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从室内积灰可以看出，这里很久没有进来人了。时尚网站总编赵一闻，对女性很不好。被他甩掉的女友陈瑶扬言报复他，给他造成詹姆斯从未想过一只流浪的橘猫可以拯救自己的人生。戒毒成功后的他与猫咪鲍勃过着贫苦却温馨的日子,一人一猫的卖唱风景总是能在街头成为焦点,为他们带来更多收入。眼看着生活开始有了起色,不料鲍勃却突然受伤,詹姆斯也面临着被迫和鲍勃分离的危机……"Of course, it is impossible for fur to resist bullets. As long as you hit it accurately, you can kill one with a maximum of two shots. The speed is not slow, but it is not impossible to hit. If they only run on flat ground, then there is really no threat, but-they will drill the ground!"这样的时刻肯定是令人开心的，大伙捞鱼、烤鱼、吃鱼，直闹到月上中天。