若提供者接受了一个消费者驱动的契约，那么它只需保证已有约束仍能得到满足，即可自行改进与修改其服务。
As part of adopting a consumer-driven contract, a provider is free to evolve and innovate its service offering just so long as it continues to satisfy its existing obligations.
最简单的消费者契约，就是对服务提供者与消费者之间交换的消息作断言。
The simplest consumer contracts make assertions about the messages exchanged between service providers and consumers.
服务契约定义了交互参与者(服务提供者与服务消费者)必须(直接或间接)达成一致的术语、条件和交互规则。
A service contract defines the terms, conditions, and interaction rules that interacting participants [service providers and consumers] must agree to (directly or indirectly).
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