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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:III. SYN Attack Tool　　辛载夏饰演复健科的实习生金南宇，他就读于保健大学，和朋友申敏浩一起在医院实习。防御工事和堡垒已经多处损伤，越军也付出了极为惨重的伤亡，本来接近三千的兵力，如今也只剩下堪堪不到一千人。赵文华露出了惊疑的目光，此番我前来浙江，一来受皇命祭海，二来也是整风，江浙一带之所以倭寇频犯，实乃地方拥兵自重，任倭寇劫掠百姓。4. Learn from wordsThe new BMW 3 Series is already the sixth generation of the car series (code-named F30 and code-named F35 for the long-axis version). With the rapid development of the automobile industry in China in recent years and the continuous improvement of people's living standards, new BMW 3 Series emerge one after another on the road. It can be said that such a good era gives many people the opportunity to feel pure Bavarian control.