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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:"You said 'similar'? Does it mean that in addition to the unknown creatures that attacked you twice before, there are new unknown creatures' participating in the war '?" I asked.再者，咱们极少夜晚登陆补给，鬼知道咱们什么时候来，什么时候走。事已至此，还有什么不能说的。“星际迷航”系列将推出新剧《星际迷航：奇异新世界》(Star Trek: Strange New Worlds)，主角为Christopher Pike、Spock、Number One，这三人组的“发现号”衍生剧真的来了。After selecting two bags of baby supplies, the victim wanted to leave the unit. Liang immediately pressed his hand on his waist and abdomen, his face was twisted, and his mouth kept making "silk" sounds, which was very painful.　　辉煌的同时，对阿梅来说，最大的打击来自于身边所爱的人一一失去：姐姐患子宫颈癌去世，挚友天皇巨星耀文病发逝世，阿梅发现自己虽然成为巨星，