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In the historical substitution principle, the methods of the subclass to the parent class should not be overridden or overloaded as far as possible. Because the parent class represents a well-defined structure, subclasses should not destroy it casually by interacting with the outside world through this standardized interface.每一次甜蜜的欢聚都让最后的分离痛得更加清晰。撕心裂肺的痛，终于煎熬出凄丽的爱情。尤佳期，大名广告公司业务经理，在一次新车推荐会上猝不及防地与初恋男友孟和平重逢。尘封已久的心骤起波澜，两人都发现对方在自己心中依然占据最重要的位置。然而和平的母亲肖云是横亘在两人之间一道不可逾越的冰峰。就在和平要违背母亲意愿与佳期再续前缘的时候，他最好的朋友阮正东(东子)却对佳期发动猛烈的爱情攻势，但他的攻势后面却深藏不可告人的秘密和深远的计划。东子是个富家子弟，也是大名广告公司的大客户，为人才华横溢，放荡不羁，身边女友不断。佳期对他避犹不及。阮正东的妹妹西子是电视台知名主持人，对孟和平芳心暗许，势利的肖云也希望和平能娶西子为妻，但和平心有所属，视西子为妹妹，令西子惆怅不已。因为业务关联，佳期不知不觉中与东子联络增多。被西子与和平误认为已经相恋。孟和平无法解开佳期心锁，又担心东子伤害佳期的感情，情绪低落通宵买醉，误将探望的西子当做佳期。佳期欲撮合静安与学长徐时峰，却不料两人早因争抢出租车“结怨”。静安痛击色魔就这样，张无忌、赵敏、小昭、周芷若、殷离、金花婆婆等人，一起齐聚冰火岛。Explain that in the OrderPizza method, we do a lot of things, including calling the CreatePizza method to generate a desired pizza, and then doing a series of operations on the pizza. The key point is that Pizza is defined as an abstract class, which means that in the OrderPizza method we don't care what type this Pizza is at runtime, in other words, this is decoupling. The coupling between PizzaStore and Pizza is uncoupled.故事讲述20世纪40年代，芭芭拉皇后号从巴西里约热内卢启航，船上乘客各个怀有目的，且有着不为人知的秘密。惊涛中暗藏未知与危险，无人能置身事外。洪霖冷笑对板栗道：你当我想护着那个蠢货？你若是不信，只管往大了闹，横竖这事与我无关，爱怎样闹随你。