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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:"Yes, it's the kind of big rats. They are more difficult to deal with than big wasps. Especially when these two things go together, one is in the sky and the other is underground. We should be too busy to take care of them. Moreover, the kind of big rats have very strong teeth. It's a piece of cake to bite off their arms and legs in three or two, and they move very quickly." Zhang Xiaobo said.就像随手买了一张彩票后，又随手扔到了一个角落，然后几天后，有人来告诉你，你中了五千万大奖。The network cable is the transmission medium. A computer can correspond to multiple IP addresses. In fact, the network card interface of a computer corresponds to one IP address. If the computer has two network cards, then the computer can have two IP addresses!NBC剧集《罪恶黑名单》宣布续订第8季。 该剧也刚庆祝了总第150集开拍，目前播到第7季，下半季将于3月20日回归，本季和第6季的收视都较为稳定，是续订因素之一。大苞谷觉得痛彻心扉，当年被狼叼走也没这样心痛过。多谢毛公子。