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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:Specific steps:2. Select the Drawing Tool Format tab and click the button of the Shape Style Group as shown in the figure.　　Season 4, Episode 7: The Hound of the Baskervilles《巴什克维尔的猎犬》31 August 1988This strategy is mainly implemented by imposing rate limits on scarce resources such as IP and accounts. A typical example of this rate limit is to require the user to resolve the verification code to verify whether he publishes too frequently, as shown above.杨长帆则撤出了中间的圈子，将场面都交给翘儿，自己只远远看着，忙活起别的事。新一季中，警视厅的搜查资料全部要电子数据化，专从搜查班和刑事资料组被解散，成员们被发派到其他部署……