The concepts behind web services help you design loosely coupled services with abstract interfaces, thus decoupling service implementation from service definition.
Web 服务背后的概念帮助您使用抽象的接口设计松散耦合的服务，这样就可以把服务实现与服务定义分开。
Interfaces and interface members are abstract; interfaces do not provide a default implementation.
介面和介面成员是抽象的，介面并未提供预设实作。
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