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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:杨长帆瞪眼道：还能掰扯成这样？何心隐无奈摇头：你们这些个文人呐……执笔一支，黑的也能说成白的，我瞧不起你。可凡事不能轻易认输，夏侯婴立即调动兵马反攻，希望能阻拦越军，至少要尽可能地减少伤亡。《灯下罗曼史》因为离得近而看不见对方，对于终于要面对的那一刻，在爱情和友情之间我们会是什么样子呢？新费雪小姐探案集第二季…,此时此刻，虽然所有的主动权都掌握在自己手中，但是范增却感到分外的紧张，甚至不必刘邦和项羽差差多少。　　1927年4月12日，蒋介石发动了震惊中外的“四·一二”反革命政变。在反革命“清党”的腥风血雨中，板凳的大师兄常墩子身为一个共产党员，在执行任务的过程中惨遭敌人的杀害。临终前，常墩子将一个流浪儿红儿托付给板凳，板凳便由此踏上了“九死一生”的险途。