The general or abstract idea of beauty is thus a radically different kind of thing than an individual beautiful object.
于是，美的普遍抽象理念和美丽的个体有着根本区别。
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The Template Method pattern defines the skeleton of an algorithm in a base class, using abstract methods and overriding to defer individual details to child classes.
As such, we are not dealing with individual people or systems; rather, we have encapsulated the details of those who interact with the system in an abstract entity that we call the actor.