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B) Design principles. Many people have listed seven principles, such as single duty principle, opening and closing principle, Richter substitution principle, dependence inversion principle, interface isolation principle, composite reuse principle and Dimit principle. LSP, I elevated it to one of the three cornerstones of the object-oriented paradigm; Single responsibility and interface isolation are mainly used as the principle of responsibility division in object-oriented analysis/OOA, which you can not pay much attention to at this time. Relying on the inversion principle, I throw it away as garbage, because the opening and closing principle or directly "relying on abstract type principle" already contains the essence of relying on the inversion principle, while the dross of relying on the inversion principle is inherited by IoC. Of course, the pullback, I emphasize very much. Therefore, you need to master the abstract dependency principle (OCP), one-way dependency principle (including the learning of callbacks) and the minimum dependency principle (composite reuse principle, Dimit rule).即便是他们拿下了临江国，短时内也不会轻易和我们开战，不会死要做些预防才是。铸剑大师欧冶子舍生取义，帮助正直淳良的青年干将前往楚国铸剑，并借机刺杀穷兵黩武的无道暴君。而干将与莫邪的爱情经历了阴谋与误会的考验，也更加坚贞不渝，富于传奇色彩……干将被楚王杀害后，莫邪带着儿子眉间赤隐姓埋名、忍辱偷生。十八年后，在爱人青萝君和母亲相继遇害之后，赤知道了真相，燃起 了复仇的勇气。亦师亦友的山中客，目睹了赤的遭遇，决定帮助赤完成复仇…… 1944年，国共合作抗战期间，猎人出身的国民党上尉牧良逢授命率领特战队，摧毁日军研制氰酸手雷的秘密武器研究所；在中共地下党员张觉、刘晓贤的帮助下，历经重重艰险完成任务。但期间，身为坚定共产党人的父亲牧大明被杀害，妻子柳烟也遭受迫害而丧失记忆。深受刺激的牧良逢武断认为是共产党造成了这一切，开始仇视中共一方。在识破并阻止日军一次针对国军高级将领的刺杀后，牧良逢受命带领特战队阻击日军进攻，但约定好的后援却迟迟未到。陷入绝境的特战队被中共游击队不惜代价地解救出来，期间中共党员大无畏的牺牲精神改变了牧良逢对共产党的看法。在中共地下党的帮助下，牧良逢查出幕后真凶的身份，使他真正认清了国民党某些高级将领消极抗日的的本质；为了挽救即将崩溃的战局，牧良逢的特战队与中共游击队并肩一处，开始了一场惨烈悲壮的战斗。戚继光这才说道：这样……我吩咐庞取义将杨长帆家人接到沥海所去住。