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The principle of opening and closing means opening to expansion and closing to modification. When the program needs to be expanded, the original code cannot be modified, but the original code should be expanded to achieve a hot plug effect. Therefore, a summary of one sentence is: in order to make the program scalable, easy to maintain and upgrade. To achieve this effect, we need to use interfaces and abstract classes, etc. We will mention this point in the later specific design./cat (cat)Matt LeBlanc将出演CBS新喜剧#I’m Not meijubar.net Your Friend#，讲述Matt饰演的承包商在妻子重返职场后，他发现养育孩子要比想象中困难得多。梦幻书院开学啦！新的学期小伙伴们将一起出去游玩。游学路上妙趣横生，不知道可爱的小伙伴们又会遇到什么有趣的故事呢？《梦幻西游》手游同人小剧场即将开课咯！敲黑板！记得认真听课，梦幻书院的师父们还有江湖秘技要传授给大家哦！！Jim Phelps is the new leader of the Impossible Missions Force, with no explanation, or even reference made, about the departure of predecessor Dan Briggs. First up for Phelps is a mission involving the drug trade. Cresnik and Walters have cornered the heroin market and sell it at a handsome profit to gangs around the world. Phelps devises an operation which will drive a wedge between the heroin dealers and their customers.可只要一从郑家出来，就又觉得心里空空的，想立即回头找他，因怕人笑话，才强忍着，回去后又惦记。米问天（原名大悲）与楚青阳（原名万心）原本同是明惠帝之子，却因幼时惠帝叔父朱棣发动“靖难之变”叛变而骨肉分离。米问天被惠帝手下的护卫救走，而楚青阳则不幸落入仇敌楚公公之手，并因此认贼作父。多年后的一天，米问天在山寨中长大成人，并顺利通过成人礼测试而成为山寨勇士；而楚青阳却在东厂度过自己的二十岁生日，并在生日宴会上结识了富家女白羽彤。米问天、楚青阳两兄弟，一个在重义气的山寨中长大，一个在重权势的东厂长大，个性截然不同。不过因年幼时惠帝让两人分别吞下既可长生、又可增加功力的极阴水龙珠、极阳火龙珠，多年来两人不得不承担着极寒与极热所带来的痛苦。当米问天、楚青阳在二十岁上偶遇时，因骨血相连，并因体内的水、火龙珠作怪而相互吸引。两人互相欣赏，进而结为“异姓兄弟”。