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"Is-A" refers to the "one" of one class and belongs to another class, while "Has-A" is different, which indicates that a certain role has a certain responsibility. A common reason for the wrong use of inheritance instead of aggregation is to mistakenly treat "Has-A" as "Is-A". For example:赌坛风云，变幻莫测。身为赌坛顶端的人物赌神唐远在家中遭到暗杀，其膝下有两个女儿，唐奕和唐欣。唐欣远在国外，振新唐家的重任交落在唐奕的肩膀上。李优为了帮男友林平知还钱，跟包达仁借了二十万，这事被小波知道了，觉得李优骗了他老爸的钱，对李优越发不客气。Some people ask me, don't I envy my family for celebrating the New Year together? I want to say that people who have not eaten chocolate will never know how delicious it is and will not miss it.《怪奇物语 Stranger Things》（原名《Montauk》）。本剧背景设置在上世纪八十年代的印第安纳州，一个小男孩神秘的消失了；他的朋友、家人以及当地的警方开始竭力找寻答案，但却被卷入了一个充斥秘密试验和恐怖超自然力量的神秘事件中，一个陌生的小女孩看似也与这起事件有莫大的关系。本剧由年轻的类型片电影制作人Matt Duffer和Russ Duffer编剧并执导，由Shawn Levy担任执行制作人。