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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:本剧以龙门古镇为背景，讲诉了薛佳凝扮演的楚笑笑是北京长大的80后女子，人气小生杜淳饰演的男一号则是龙门古镇的孙氏后代孙翌伟，清华毕业(学汽车制造)，又出国留学，后回到北京工作(IT行业)，由于被初恋女友佟洁抛弃，过失致使哥哥死亡,心里承受着巨大的压力。30多岁还未成家，家人最盼望的就是他能带个媳妇回家过年，于是他就开始网上租女友，于是楚笑笑和孙伟伟就成了一对“合约情人”。而这对“合约情人”回到龙门古镇一方面要讨得家人开心，又暗中斗法，幸得孙翌伟的外甥钟垒(冷中易饰演)的暗中帮助，最终获得真爱谱写浪漫的故事。White 132% +10%但是陈启却不这样想，大众是开始审美疲劳，但是如果这部剧和《白发魔女传》，和《绝代双骄》，乃至和市面上其他的武侠剧都不同。1, Putonghua level should meet the "Putonghua Proficiency Test Grade Standard" issued by State Language Commission Grade II, Grade B and above standards.　　该季仍然10集，将于9月10日播出。The second type of data poisoning attack is to weaponize the user feedback system to attack legitimate users and content. Once attackers realize that you are using user feedback in some way for the purpose of punishment, they will try to use this fact for their own benefit.