abstract base class

基本解釋

To begin we create an abstract base class which represents the service we want to expose.
首先，我要?jiǎng)?chuàng)建一個(gè)抽象基類，用於表示我們要公開的服務(wù)。
If an abstract base class is not appropriate, Interfaces can be chained together to build up functionality.
如果不適用於抽象基類，可以將接口串聯(lián)在一起，以搆建其功能。
The customer class can be an abstract base class for a family of different customer types, such as private or business customer.
客戶類可以是用於許多不同客戶類型的抽象基類，比如說私有客戶或業(yè)務(wù)客戶。