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AI-CPS OS\\"灭亡迅雷站的成员——亡正式登场了！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 ~ ~他清楚现在关中的局势，知道越军拿下崤山三关所起到的作用和重大意义。　　全球首部茶文化原创动画片上蔡，对于中原与淮南交汇一带，相传人类始祖伏羲氏因蓍草生于蔡地而画卦于蔡河之滨，遂名其地为蔡。Key, numeric key 8 (keypad): nose down, key, numeric key 2 (also keypad): nose up, lift height, left key, numeric key 4: aileron of the plane will control the plane to somersault left in the air (be careful for friends who feel dizzy and carsick), right key, numeric key 6; The aileron of the aircraft will control the aircraft to somersault to the right in the air. Number key 5 (keypad): stabilize the aileron of the aircraft, letter G: lower and retract the landing gear (an area on the screen has a word beginning with G, disappearing means retract the landing gear), and H key; Close the control view (only experts can), but the flight will continue. F key: for landing, I don't know what role it plays. Space bar: pause the flight, but don't exit. ESC key: exit.