service requesters 服务请求者
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Service requesters and providers interact by exchanging messages.
服务请求者和提供者通过交换消息进行交互。
Existing requesters can be connected, without change, to new providers.
现有的请求程序无需更改即可连接到新的提供程序。
Interface: Requesters and providers don't need to agree on a common interface.
接口：请求者和提供者不需要就公共接口达成协议。
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