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七十年代中期，马春霞难产生下杨辉，李宝成认为儿子不是亲生骨肉，将其遗弃。街道工人杨妈年轻丧夫，省吃俭用，虽然家境贫困，但对杨辉百般呵护，并培养成人。苦苦寻子三十年的马春霞，终于找到了亲生儿子。因为认子问题，生母和养母两家发生矛盾。身为院长的李宝成与外科主任杨辉矛盾重重，却不知杨辉就是自己的亲生儿子。危难时刻，身为博士后的脑外专家杨辉，成功为患有脑中风的养母做了开颅手术，后给病入膏肓的生母捐献了一颗肾，体现了对养母和生母的情与缘。最终，杨辉与自己心爱的姑娘喜结良缘。结果，哪里不走。一百年前，美国飞行家Art Smith的飞行表演，不约而同改变了台湾青年谢文达与朝鲜青年安昌男的一生，他们前往日本学习飞机操纵，试图以飞行与殖民者日本人一较高下，那是他们唯一能代表家乡，扬眉吐气的机会。他们有着相似的前半生，却有完全不同的命运。两人再次于空中相遇，竟是判断遭遇敌机，准备朝对方开火迎击……Zhang Liang took six classes, each lasting 15 minutes, and was said to have prepared for three or four months. In the final recording stage, he flew from Shanghai to Beijing, although it was only audio. It is enough to show that the mode of education and recording classes is very heavy.Liskov Substitution Principle, LSP (Richter Substitution Principle) means that subclasses must replace their parent types. In other words, in the process of software development, after the subclass replaces the parent class, the behavior of the program is the same. Only when the subclass replaces the parent class and the function of the software is not affected can the parent class be truly reused, and the subclass can also add new behaviors to the parent class. In order to look at an example of violation of LSP principles, the specific code is as follows:URL Request Handling Tool JustForFun