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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:胡宗宪不假思索道：万事俱备，只求开关　　根据精神健康慈善机构Mind的说法，患有纯粹强迫症的人，不会显现出强迫性外在迹象，比如反复检查某样事物，反复清洁等。但他们仍然会经历精神强迫：例如检查他们的情绪，或检查他们是否被某种特殊的侵入性思想所激起性欲等。Lady GaGa确认回归《美恐6》！在她的最新Z100电台采访中，GaGa本人证实她确定会出演《美国恐怖故事》（American Horror Story）第六季：“但我不能保证我会如何、何时回归。”Sun chien why residual blood can resist deadly. . . This is due to this fifth level.The column of "National Map Open Class" is divided into political history, traditional culture, interpretation of ancient books and records, economic forum, art appreciation, science and technology lectures, intangible cultural heritage explanation, educational schools, life classes, other topics and other categories. Courses such as "Huang Yang: Socrates' Death and Athens' Democracy", "Zhao Feng: Characteristics and Status of China's Mulberry Silk Weaving Skills", "Li Jianrong: Wisdom Played-Three Leaps in Human Thinking" and "Introduction to Yongle Ceremony" are impressively listed.