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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:To correct an iframe problem before giving an example, someone will write it directly on a third-party page. As follows:那是很久以前的事了。那个时候，还没有冥界，天柱连接着天和大地，天空不像现在的天空，那时候的天，悬在云端里。在后世的记载中，它还有一个名字，叫做“昆仑”。人类，是神创造的，世间一切，都是神的子民。昆仑山的天女来到了人间。天女，是神的使者。然而在人类中，出现了一种疾病，那是一种令人丧失心智的疾病，那就是...DNF2018 Independent Treasure Pearl Complete Book第一次世界大战后，她的家人被她父亲杀害，一个年轻的女人被送到一个修道院。 然而，她的恶魔以各种方式跟随并表现出来，带来了她过去的噩梦。上仙端木翠和展颜进入沉渊之后，端木失去记忆，而江文卿的到来将端木翠和展颜卷入到一场绝世阴谋当中。沉渊之内，变数丛生，人幽大战在即，到底是历史重演还是会因展颜的到来而发生改变？一个是叱咤沙场的端木将军，一个是双商在线的启封总捕头，二人联手共破危局，N生N世，一人一仙，上演仙凡旷世绝恋。蓬莱九狱，天上人间，剪不断的爱恨纠葛，理不清的生死痴恋，惟愿披荆斩棘，与君同行……人族幽族蓬莱三族携手并肩，共建三界太平。Look at the code of the database connection pool: