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The fundamental reason for using design patterns is to adapt to changes, improve code reuse rate, and make software more maintainable and scalable. In addition, the following principles should be followed when designing: single responsibility principle, open and closed principle, Richter substitution principle, dependency inversion principle, interface isolation principle, composite reuse principle and Dimit principle. Each design principle is described below.虽然我不知道我师父是干什么的，但是他好像很厉害。A fallen priest, a legendary demon hunter, and a modern day superhero join forces to battle evil.在一个电闪雷鸣的日子里，身陷囹圄的一只耳成功越狱，引起黑猫警长的高度重视。次日一早，崇拜黑猫警长的小猪三嘟被伙伴大壮拉走，偷偷进入了即将开幕的翡翠之星博物馆。博物馆的前身是一座宇宙飞船，六十年前由羊山博士亲手开发。正当他们玩得不亦乐乎的时候，两个小家伙突然看见了鬼鬼祟祟的一只耳以及一个身材魁梧穷凶极恶的邪恶之人。这个家伙声称曾遭羊山博士背叛，当得知羊山博士已经去世的消息，他一腔怒火无处宣泄。狡猾的一只耳怂恿对方将复仇对象转移到全城人们，等后天博物馆开幕之际将市民全部绑架。