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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:韩信自然不能有丝毫的违拗，当即道：是，臣即可都动身。(3) If a signal lamp is provided for this signal, it shall be a ring-illuminated white lamp with a visible distance of at least 5 nautical miles and shall comply with the requirements contained in Appendix I to these Rules.故事以祸国殃民的「黑米」鸦片为题材，自鸦片传入中国以来，不知多少人因毒瘾而丧失心智；不知多少家庭为吸食鸦片而倾尽家财? 家散人亡；不知多少百姓毒癖深种而变得颓靡不堪！故有歌云：「大烟是杆枪，不打自受伤。几多英雄汉，困死在烟床！」晨间剧《夏空》讲述了这样一个故事：奥原夏是一个失去了双亲的少女，治愈这位受伤少女并将她培养成一个坚强的人的是北海道十胜郡的土地。终于长大的成人的奥原夏凭借着十胜所赋予她的想象能力，向着当时还被称为“漫画电影”的动画世界发起挑战。 女主角奥原夏虽然是一个失去双亲并与兄长分离的少女，但是凭借着北海道出身者的“开拓者精神”向名为动画的荒野进发。剧本大森寿美男表示：“想将如此巨大的伟业和广濑铃这个稀世的女主角重叠在一起，主题开门见山地说就是‘开拓’和‘链接未来’。Method 1: Delete the rule according to the rule numberHaving seen too many life and death, Huang Weiping often feels powerless. People often think carefully about the proposition of "life and death" when they are dying, but it is too late. At that time, patients and their families are mainly faced with a series of practical problems and have no time to take care of more metaphysical things.