holder类的内容是通过远程方法调用修改的，且服务客户机在方法调用后可以使用这些修改过的内容。

The contents of the Holder class are modified by the remote method calls and the service client can use this changed content after the method invocation.

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松散——所有不兼容的更改导致服务契约的新版本，且服务契约的设计既支持向后兼容，也支持向前兼容。

Loose - Any incompatible change results in a new version of the service contract and the contract is designed to support backwards compatibility and forwards compatibility.

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这些认识上的一致大部分都能在服务水平协议(Service - Level Agreement, SLA)进行捕获，形成服务提供者愿意提供且服务使用者愿意接受的可度量目标。

Much of this understanding can be captured in a service-level agreement (SLA), measurable goals that a service provider agrees to meet and that a service consumer agrees to live with.

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