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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:Death Designed for the LivingThe 300 damage minus defense from the attack coefficient is too exaggerated. Is it not all invincible to add hundreds of defense to a weapon upgrade? The feeling should be that the total attack minus the total defense on the opposite side, and then X the attack coefficient. There are more defensive characters than melee characters. 20% of the attacks are defended, even if 5,000 attacks have 1,000 defenses, who can break the defense?在一座名叫“不知处”的古老宅子里，被借走运气的倒霉少女和拥有“借东西”能力的神秘国师展开了一段甜蜜又奇妙的同居生活。连理由都不知道，就这样每天不停地战斗……。精神科医生高静在工作中凡事以病人的健康为重，小凯是高静的病人，透过小凯的介绍，国栋认识了高静，二人一见如故爱情升温。为了向高静求婚，国栋、高静、小凯前往与那国岛，潜入海底找出藏在那里的钻戒。谁知国栋出事了，只打捞起一具无头的男尸。对国栋的生死未卜及思念让高静陷入迷离，她透过病Simon的引导，看到一些不该看到的光景。高静求助精神科医师Edward，看着小凯带回的铁箱，高静再度陷入寻找国栋的迷思中。II. Handling Methods