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Typical plot: Your boyfriend is ordered to call back when he counts to 3, but in fact he will keep counting two and a half and two and a half to delay the time. [2]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 Baidu2. Then add a cache list to the publisher to store callback functions to notify subscribers (for example, the above buyer has collected the seller's store, and the seller has collected a list list of the store).　　爱德华发现自己喜欢上了维维安，但又碍于面子不能出口。菲利普出了个主意，花3000元雇她一周作为出席交际活动的女伴。维维安接受了爱德华的要求。当她装扮停当赶到时，看上去俨然是一位贵妇人。在用餐时，维维安对年轻的戴维发生了兴趣；而在马球比赛时，两人又热切交谈。这引起了爱德华的醋意大发。回到旅馆后，维维安发现自己已爱上了爱德华，两人谁也不能离开对方了。　　但不管怎样，毛绒绒始终以一颗善良纯真的心来应对一切，她常常站在他人的立场上处理问题，热心给守寡多年的婆婆张罗对象，对余快与前妻所生的孩子也真心相待。她的所作所为让婆婆和余快前妻也最终折服，在经历了那么多的“幸福的折磨”后，毛绒绒也终于怀上了小孩，一家人和乐融融。这是一个女性视角讲述的女性成长故事，毛虞子期和项庄都有些不敢相信，这还是那个勇敢威武的楚霸王吗？…,你们来了？项羽淡淡地应了一声，这个时候他实在是提不起多少兴致。在我国北方某地国境线上，发生了一起越境敌特被我击毙的案件。公安局侦察科长李欣等奉命赶到现场，他们认定敌人搞的是双线派遣，另一特务已潜入境内。潜入的特务沿途布雷，老魏爷在追捕中触雷负伤。李欣奋不顾身跳崖排雷，跟踪追击敌人。潜入江城的特务，冒充转业军人，化名周英杰，与潜伏特务“紫貂”挂上了钩。“紫貂”通过“熊钟”这个联络工具，控制着代号叫“银狐”的特务康一挺，巧妙地指挥周英杰的活动。“紫貂”通过周英杰，与某国驻我国大使馆以外交官身份出现的间谍取得联系，又通过康一挺，借“八一四”战备工程总工程师夏明非之手，把周英杰安插在该工程当汽车司机。为了搞清敌人活动的来龙去脉，李欣以“安全检查员”身份，深入到“八一四”工程里去。“五一”游园会上，李欣以“上司”身份从康一挺口中知道敌人“上司”的代号叫，“紫貂”，同时知道敌人已把窃听器通过夏明非带到了市委战备工作汇报会上...