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嗯，很好。The next four patterns, including this pattern, are all the relationships between classes and do not involve inheritance. When learning, you should remember induction and the diagram at the beginning of this article. The observer mode is well understood, similar to email subscription and RSS subscription. When we browse some blogs or wikis, we often see RSS icons. This means that when you subscribe to the article, you will be notified in time if there are subsequent updates. In fact, in a nutshell, when an object changes, other objects that depend on the object will be notified and will change with it! Objects are a one-to-many relationship. Let's look at the diagram first:魔鬼混血儿是指魔鬼与人类之间的孩子，因此，一到关键时刻，额头就会出现五角星，并能发挥神秘魔力。那是一种传说中的力量，足以毁灭世界。"刹那"与"未来"之所以能够驱使"德比拉泽" 和"比内高"与魔鬼敌人战斗交涉，召唤魔鬼同伴，就是因为他们是魔鬼混血儿。魔鬼混血儿"甲斐 刹那"和"要 未来"有何宿命？所有谜底都在魔界。一九四二年，中国守军在日寇的大举进攻下作战略撤退，以于刚为队长的八路军武工队，挺进沦陷区，引领令珞丹的特遣队，一起袭击鬼子的运输列车，炸毁鬼子的弹药库，保护交通要道。武工队打入城内，救出被关押的中国人。鬼子控制了战略要地大峡谷，收买了当地的头面人物，阴谋取得觊觎已久的珍贵珠宝文物。武工队和特遣队以民族大义为重，经耐心细致的思想工作，激发了百姓们的抗日热情，动员百姓团结一致抗击敌人，保卫自己的家园。经过持续努力，沦陷区抗日力量日益壮大，军民一致行动，使日本鬼子逐渐陷入被动，敌占区成了被包围的孤岛。武工队和特遣队作为先头部队掌握了鬼子的军事部署和动向，扫清了障碍。我军适时地发起了总攻，攻克了城池，收复了失地。分家可少不了收拾，她是能塞的都使劲塞，能拿的都让儿子拿。