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Let me explain the role of these classes: MySubject class is our main object, Observer1 and Observer2 are objects that depend on MySubject, and Observer1 and Observer2 must change when MySubject changes. The AbstractSubject class defines a list of objects to be monitored, which can be modified: add or delete monitored objects, and when MySubject changes, it is responsible for notifying the objects that exist in the list. Let's look at the implementation code:　　特诚惶诚恐地回到食客身边，冒死向马立报讯，马立围捕以食客为首的一帮人，双方爆发激战，食客带领多特且战且退，并受了伤。多特渐渐回复记忆，记起了自己与食客和观艾(何超仪饰)的感情，也泛起无数血腥的回忆，然而，他再没有了从前的暴戾和狂热，重新做回平凡人的愿望却愈来愈强烈。黄少爷若真要谢，不妨捐些财物或银两给医学院。Reuse code. ? We sometimes like to copy code from previously written projects to new projects, which is no problem, but a better way is to avoid duplicate code bases through module references.三个男生的加入，让这所女子学校一时间躁动起来，更是让格斗社里以乔安妮为首的所有女生面临前所未有的困难。即将参加团体赛的六个人，经历了种种曲折后，从相互不了解，相互抵触，最终成为了彼此格斗生涯里最亲密的朋友，格子青春路上最重要的伙伴。