The existing class that will serve as the basis for the new class is termed a base or parent class.
那些用于服务新的的已经存在的类被称为基类或者父类。
The extending classes are formally termed derived or child classes.
扩展类被称为继承类或者子类。
Although constructors are typically defined as public, a derived class never inherits the constructors of a parent class.
虽然构造函数被定义魏公共的，继承类从来不继承父类的构造函数。
Remember, private members can only be accessed by the class that defines it.
Speaking of base classes, it is important to keep in mind that C# demands that a given class have exactly one direct base class. It is not possible to create a class type that directly derives from two or more base classes
C# supplies another keyword, sealed, that prevents inheritance from occurring.
C#提供了另一个关键字，sealed防止继承的发生。
Therefore, you can never derive one structure from another structure, a class from a structure, or a structure from a class.
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06-01 The Basic Mechanics of Inheritance
原文：http://www.cnblogs.com/cout/p/4292591.html