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晚辈可不敢当周伯父大礼。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:大苞谷还没来得及展开笑脸，就听板栗道：爹，这要是他没出过海，我相信他一定能做到。Operation method:(2) A taillight.? Add an optional formal parameter to the function make _ album () so that the number of songs contained in the album can be stored. If the number of songs is specified when calling this function, this value is added to the dictionary representing the album. Call this function and specify the number of songs the album contains at least once.　　商人董大年曾遭遇土匪抢劫，得知刘和尚血洗马家，他与警察局联手，决心为民除害。