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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:The size and layout of the room are appropriate. For example, all the participating members have seats and can communicate face to face (U-shaped or round table rooms can be used). Everyone can see the contents on the slide very well.3. Psh and ack flood attack范依兰看到彩儿的表情之后，她知道彩儿也是一心为了自己好，身边的人都在关心自己。　　Amy饰演的“Beth”，似乎过着令许多人羡慕的生活：她的成长让周遭的人都印象深刻，也成为了非常富足的酒类分销商，还和一名成功、讨人喜欢的男子建立了牢固的感情，更在曼哈顿居住。一班廉政精英，由巾帼不让须眉的女总调查主任叶帼英（陈法蓉）统领，维护社会公义，肃贪倡廉。他们包括有精明能干、经验丰富的高级调查主任廉志刚（张兆辉）；大学刚毕业便加入廉署工作的方卓文（古天乐）；性格爽朗、率直的简鸣晖（袁洁莹）；孤儿出身的罗家杰（何宝生）及思想单纯、乐于助人的刘芷珊（张玉珊）等。他们各有专长，屡立奇功，侦破多宗案件，包括警务人员包庇公寓进行卖淫活动、地产法展商勾结地产代理进行内幕认购、消防员贪污及不法商人进行军火买卖等等。