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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:影片讲述负债累累的两兄弟为躲避讨债人，逃到阿拉斯加的某处荒野后发生的冒险故事。《荒野逃生》大量戏份发生在阿拉斯加荒野中，拍摄难度非常高。The border breakout gameplay retains the familiar experiences of "heroes, skills and left and right roulette discs". Combined with the super-large open map, summoners can operate heroes, follow the movement of sandstorms, fight monsters and upgrade in changing battle areas, and pick up skills/equipment to fight.西游记一行人经过万里长征，轮回转世，世世代代，终于来到了美丽的现代。在中国最繁华的都市北京，每一个年轻人都为梦想而来，为梦想而走，他们能否扎根在这个霓虹绚烂的城市？“北漂”和“演艺圈”似乎是大家喜闻乐见的两个热门词汇，这个西游式“爱情公寓”里，大家如何在纷杂的生活中斗志昂扬，又如何用诙谐的方式去调侃和笑对那些“潜规则”，他们如何嬉笑怒骂，他们如何斗智斗勇，他们如何在“跑龙套”的人生中找到“希望的光”，他们如何用青春书写爱与执着，尽在今何在西游终结版《我的西游》。[3]Or search public accounts按这小大夫说的，也忒讲究了。