Creating a new instance of a class is called instantiation.
创建类的新实例称为实例化。
Singleton: one instance of a class or one value accessible globally in an application.
单例：保证一个类仅有一个实例，并提供一个访问它的全局访问点。
A pointer to an instance of a class.
是类实例的指针。
Each instance of a class creates a new object.
一个类的每个实例都新建一个对象。
Tests whether an object is an instance of a class.
测试对象是否为某个类的实例。
An attribute associated with an instance of a class.
实例属性：属于某个类的实例的属性。
Each instance of a class entity represents a row within the database table.
每一个实体类的实例代表数据库表中的一行。
Shared procedures cannot be associated with a specific instance of a class.
共用的程序无法与类别的特定执行个体产生关联。
Shared procedures cannot be associated with a specific instance of a class.
共用的程序无法与类别的特定执行个体产生关联。
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