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瑞安医院妇产科前任男主任左老，为热爱的妇产科事业奉献了一生，而身在妇产科的儿子左右却并不喜欢自己的工作，不但与父亲矛盾冲突不断，还跟父亲的女研究生钱小小心存芥蒂。新任男主任董思贤，在自己热爱的工作岗位上，为他人迎来一个又一个的新生命，与妻子钱蕾却一直没能迎来自己的孩子，两人甚至因此仓促地结束了婚姻。然而正如左老所深信的那样，妇产科是个诞生生命的地方，也是个创造奇迹的地方。在一次次性命攸关的争分夺秒里，左右渐渐爱上了这个工作，收获了与钱小小的爱情，也更加理解了父亲。董思贤对积极寻找新恋情的钱蕾依然关怀备至，两人始终无法割舍对方，钱蕾意外怀孕，无形中为董思贤摘掉了不育症者的帽子。终于，董思贤在妇产科迎来了女儿的诞生。分手的夫妇重新走到了一起。妇产科的医生们继续着他们关于爱与责任、理解和成长的故事。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).板栗用力点头道：嗳。而且关中之地富饶，地形与军事防御都是绝好的建都之地，尹旭自然不愿意放弃。Many years ago, there was a product form called community + e-commerce. In my opinion, it is too difficult to do this fact well. It is already very difficult for communities or e-commerce companies to do a good job in one category. You can imagine this difficulty if you want to mix these two things together and do a good job.虞子期毕竟只有一万兵马，冲乱汉军的阵脚已经是实属不易，难能可贵的，不可能有再多的奢望。