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5. Zhang Jie骊山远在千里之外，路途艰难，必要东西必须准备妥当。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:This wine has a comfortable taste, rich fruit aroma and mineral flavor.Mac因工作沉闷开设梦想中的另类CD店，聘请了奇妙少女Cat当店员。二人不自觉互相倾慕，成为亲蜜性伴侣，却从不确认恋人身份，终于Cat离开了。快要结婚的Michelle因阿哟的出现，人生计划打垮，但为原则不得不跟他分手。Mac与Michelle在CD铺面临倒闭前相遇，不禁以最原始方式排遣孤独，岂料他们之事被Cat发现，大受刺激的她遇上意外……Ha Xuesheng, director of the program department of CCTV's financial channel, concluded: "Charming China City is a bold attempt by our CCTV financial channel. For such a long time, we are also looking for a new path for our own development. We need to look for areas of expertise, look for CCTV's value, social responsibility and responsibility, integrate social resources and do programs that CCTV cannot do. "Charming China City" has found an accurate positioning this time, combining with the government and tourism resources, and using the resource integration ability that others do not have, to realize the demand resonance for the transformation and upgrading of the city, and to realize the resonance between the social and urban transformation needs and the responsibility of our program. "