A contract is any service or behavior of an object that other objects can request.
一个契约是其它对象可以请求的一个对象的任何服务或者行为。
It defines the structure and behavior of a service.
它定义了服务的结构和行为。
The behavior of this operation is completely up to the service implementing it.
该操作行为完全依赖于实现它的服务。
The behavior of this operation is completely up to the service implementing it.
该操作行为完全依赖于实现它的服务。
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