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久没谋面的“圣诞老人” 蒂姆·艾伦３月份再度出山之作《长毛狗》，上映当周便一举登上北美票房榜的头名，仍嫌不过瘾，8月再献上一部《超人集中营》。JOHN和NANCY是对恩爱的夫妻，为了逃避城市的拥挤和紧张，搬往乡村渡假屋，一日，一个神经汉闯入家中，在屋里展开了一场紧张刺激惊心动魄的困兽斗，娇弱无助的NANCY发现丈夫JOHN死于恶汉之手，被逼坚强起来，化悲愤为力量。与恶汉决一死战。Grandpa wants to eat the side dishes made by Grandma. Even if she is catching a cold, she will still go to the river to wash the dishes. She said, "If you like to eat, I will make it for you. "广袤无际的非洲大草原上，饱受干旱所侵扰的动物们耐心却又焦灼地等待着洪水的到来。今年的汛期似乎姗姗来迟，动物们心中满是不安。他们无论如何也不会想到，不远处的峡谷间耸起一座大坝，人类用它拦截了本该滋润草原和万物的水源。故事描述的蛙女是一个十三、四岁的船家女。她的亲爹是地下党。因善于潜水，被骗入旧上海的“黑龙头家”，却意外地与亲生母亲相见。原来“黑龙头”刘铁生就是蛙女母亲的后夫。刘铁生的弟弟刘铁福特别坏。刘铁生要蛙女在黄浦江底打捞一只沉了十年的银箱，而这银箱又关系着六百个工人的命运。蛙女为了不使银箱落入刘铁生手里，机灵地跟他们展开了斗争，经历了许多惊险的艰难曲折，最后终于逃出了魔掌，把银箱打捞上来，交还原主。可是蛙女的母亲却永远的离开了她们……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: