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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:章邯笑道：说什么呢？你着急地跑过来是不是想说我们这样停下来，蒲俊可就要进入江陵城了，怕被蒲将军抢去了首功是不是啊？被章邯猜中了心思，周大不由的有些脸红，低头道：知道瞒不过上将军，确实如此，我们得赶紧了。胡镇临去时望向泥鳅的目光凶狠而恶毒，恨不得凌迟碎剐了他。……这……太荒唐了吧……就因为这个？庞取义挠着头无法理解徐文长的思维，这有什么意义么？所以叫赌。6. Click to download: Communications Department's electronic signature attachment. RAR, attachment 4, attachment 6, attachment 8, fill in and affix the official seal; Annex 10, two copies shall be filled in and stamped with the official seal.