使用者可能没有使用某些已注册的服务，其原因可能是由于服务存在缺陷，如性能问题等。

The fact that certain registered services aren't being used by consumers, probably due to defects in the service, such as poor performance.

youdao

可识别依赖关系的注册中心能向使用者通知提供者方面的更改情况，如某个服务变成了已弃用状态。

A registry aware of dependencies can then notify consumers of changes in providers, such as when a service becoming deprecated.

youdao

注册中心还可以支持服务状态，如测试状态和(如前面提到的)已弃用状态，且仅向希望使用服务的使用者提供具有这些状态的服务。

The registry can also support service states, like test and (as mentioned before) deprecated, and only make services with these states available to consumers that want them.

youdao