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Recently, the author visited some cancer patients, looked through the data, got some insights, and made the following article.这么算起来，他必须在年前赶到，不然就要在路上过年了。与此同时，一个藏有邪恶力量的不明飞行物正以极高的速度接近地球，它所带来的外星人加莱克萨哈（瑞恩·威尔森 Rainn Wilson 配音）扬言要摧毁地球，毁灭人类。人类奋起反抗，但是他们的武器在加莱克萨哈面前全部败下阵来。地球危在旦夕，人们把命运寄托在了苏珊及其怪物朋友的身上……本片根据中国传统民间故事《铡美案》改编。寒门学子陈世美高中状元之后，为求功名利禄抛妻弃子成为驸马。其妻秦香莲千里迢迢进京寻夫，陈世美不仅不予相认，还派人加害其母子三人，使得秦香莲含冤入狱。包拯知道真相后，为秦香莲洗脱冤屈；公主、太后屡次阻拦包拯办案，包拯不为所动，冒着得罪皇亲国戚、掉乌纱帽的危险，毅然将陈世美绳之以法，押上龙头铡。Although there are subclasses in java that implement the interfaces of the parent class, But I think javascript can be different from java, It is possible that the parent class in java is an empty class, Subclasses to implement the interface of the parent class, in javascript, I think the common code is completely written in the parent function. If the business logic needs to be changed in the future, or new business logic is added, we can completely use subclasses to rewrite the parent class, so the code has strong scalability and is easier to maintain. Since I am not a professional java, please understand if there is any mistake in describing the knowledge points in java ~ ~绿叶第五季……B. Install yum-utils, which provides yum-config-manager, which can be used to manage yum source (the system can not execute it if it comes with it)