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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:性格幽默的王大龙四十多岁时遭遇超市易主，比失业更难堪的是新老板是他发小彭飞，夫人林骄杨曾是他高中暗恋女神。王大龙决不给发小打工，急于找工作又总是爆笑出丑，走到自杀地步却意外救了彭飞的儿子。他迫于妻女压力接受了工作，也同时踏上战场：两个发小为金钱和道义较量不断，而王大龙的环卫悍妻高彩云，和律师林骄杨几个女人间纠葛成一团。家庭事业几起几落后，“不倒翁”王大龙支撑了三个家庭和一个公司，也创造了他的“好爸”理论：假如你不幸沦为沙子，别再怨天恨地，努力把自己打造成珍珠，才无愧于男人称号[Name: Wang Zha他们也是参加过反秦之战后返回领地的，所以整军备战也需要不少的时间。严嵩一愣：阮鹗出兵了？没有，据福建来报，是被贼首杨长帆驱逐的。Regarding China's economic development, the 19th National Congress of the Communist Party of China made an important judgment, that is, China's economy has changed from a stage of high-speed growth to a stage of high-quality development, and is now in a key research period of transforming its development mode, optimizing its economic structure and transforming its growth power.29岁主人公常时在受到爱情和事业的双重打击之后，找来发小一起买醉，在酒精的催化下回忆起儿时想当一名伟大的科幻作家的梦想，于是发誓一定要写出一部惊世神作否则绝不踏出家门半步，闭关创作的三个月间，常时断绝了与外界的一切联系，三个月后，当他再次走出家门的时，世界已发生了巨大的变化，街上空无一人，手机信号全无，聪明绝顶的“熊孩子”成了这个世界的统治者，而正常人都被熊孩子变成了“弱智”。就在逃脱“熊孩子”魔爪的时候，常时遇见了尚宪、鲁丹、希哥等人，组成了地球保卫队，肩负起守护人类最后智商的使命，开启削死“熊孩子”的征程…