a parent class的意思|示意

A child (or derived) class can have one and only one parent (or base) class.

一个子(或继承的)类只可以有一个父类(基类)。

The primary constructor in a derived class must invoke one of the parent class constructors, either the primary constructor or an auxiliary constructor.

子类的主构造函数必须调用父类的一个构造函数，无论是主构造函数或者是辅助构造函数。

This method accepts four arguments: a property, a property value, a class, and a parent test object.

该方法接受4个参数：属性、属性值、类和父测试对象。

Optimistic concurrency is implemented by assigning a datetime field to each parent class being CRUDed.

开放式并发通过给每个被“凝结”的父类分配一个 datetime 字段来实现。

By default, when you create a subclass, its constructor merely calls the constructor of its parent class.

默认情况下，当您创建一个子类时，它的构造函数只调用其父类的构造函数。

Each application of this generic class would extend a distinct parent class.

这个泛型类的每个应用都会继承一个不同的父类。