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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:这样……咱们从长计议……这两天戚将军就会有信来，交代过后再谈见父母。User.py太阳升起后，满谷的桃花灿若云锦，湖边爬满了大大小小的乌龟，鸟儿悠闲地鸣叫，一切都是那么祥和。"'let the dog bite '? Is the" dog "you said a real dog or something else that behaves like a dog?" I have some experience in hearing this, He interrupted and asked again in a "sure" tone. The reason for this is that in the interview at position 169, Qi Shicheng mentioned that the Vietnamese army's humanoid monster in tattered military uniform was like a dog when running, so when I heard Liu Guangyuan also talking about "dog", I was not sure whether the "dog" he said was a "living biological weapon" with Qi Shicheng.弗朗机舰队一时之间没打算滚，而是迂回航行，避开锋芒，也未打旗号。