英文: Any class with an abstract method is automatically abstract itself, and must be declared as such.A class may be declared abstract even if it has no abstract methods.
中文: 任一类以一个抽象方法自动地是抽象的本身,且必须被声明,一个类可以被声明是抽象的既使它没有抽象方法。英文: Abstract: Grey diagnosis is introduced.
中文: 文摘:介绍一种灰色诊断法。英文: Q:What is an abstract class?
中文: 什么是一个抽象类?英文: Your reasoning seems very abstract.
中文: 你的推理似乎很抽象。英文: When a nonabstract class is derived from an abstract class, the nonabstract class must include actual implementations of all inherited abstract members, thereby overriding those abstract members.
中文: 当非抽象类继承一个抽象类时,非抽象类必须包含所有继承的抽象成员的实现,因此覆盖所有的抽象成员.