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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:尹旭抬头看去，正好看见几头吃饱的青牛踏着悠闲的步子，缓缓而来。…,自责已经没有任何用处，只能走一步看一步，小心处理才是。谢谢大家一直的支持，真的，太谢谢了。一场伸张正义的战争，一个普通的年轻军人，一段唯美的爱情交响曲。由北京友视文化传播有限公司和八一电影制片厂联合出品的新剧《高粱红了》，带着东北雪乡独有的气息，从硝烟弥漫的战场中走来，向人们讲述了那个年代一群蓬勃昂扬年轻人的青春故事。你姑姑那时候可吃了不少苦，咱们家就她当家。"What was the final treatment of Jiang Yong's injured left arm?" I asked.