OOP concept: is it possible to update the class of an instantiated object?
面向对象的概念：它是可能的更新的一个实例化的对象的类？
Properties of each class describe various features and attributes of the control concept.
每个类的属性描述了各种特性和控制的概念。
The concept of plane slippers from South Korea, develop with launch, first-class quality.
飞机拖鞋的概念来自韩国，精心研制推出，品质一流。
"Each class must have knowledge of the growth point" concept.
“每一堂课都要有知识增长点”的观念。
"Each class must have knowledge of the growth point" concept.
“每一堂课都要有知识增长点”的观念。
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