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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:莱克斯·卢瑟带领的末日军团遇上黑暗君主达克赛德，这次又会对正义联盟的小伙伴们造成什么麻烦呢？Blacklist table structure:The determination of the minimum wage standard generally takes into account factors such as the living expenses of urban residents, the social insurance premiums paid by individual employees, the housing accumulation fund, the average wage of employees, the unemployment rate, the level of economic development, etc. The formula can be expressed as:刘邦立即跳下马来，笑道：此番多亏了彭越将军弃暗投明啊。3472　　1941年，太平洋战争爆发前夕，国际反法西斯同盟特使秘密访华，召集国共双方地下情报组织代表，召开秘密会议，商讨双方在敌占区对日情报的工作配合。汪伪特务机关大肆布置抓捕行动，不料却意外扑空。与此同时，汪伪破获一军统情报站，通过对交通员的严刑逼供，得知密