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　　Terry父亲肉干厂的生意因“台湾肉干王“侵占市场而日渐衰败。他委托国斌父亲任职的广告公司设计广告，因两人有前嫌，Terry父亲对国斌父亲的创意不满，两人关系更为恶化。 EM3班来了位新老师，她鼓励学生让他们建立自信。文福和Terry的成绩都有提高。国斌因达不到母亲的要求想自杀，被警方救回。母亲气昏入院，验出患了血癌。为救国斌的母亲学校倡议学生和家长一起验血，Terry的骨髓合适，这次他不顾父母的反对自己作出了决定。国斌的母亲得救了。国斌的父亲帮助Terry父亲的肉干厂设计了新的市场营销推广方案，使Terry父亲也度过的难关。经此，文福的成绩该来的，还是来了。秀儿呢？尹旭关切地询问起二女儿。他早就发现板栗护着秦淼，认为这是他的弱点，遂两边齐上。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.What kind of water are you drinking