Since a service provider can do its work by requesting other services, you can use a layered composition of services for your design.
由于服务提供者能够通过请求其他服务来完成自己的工作，在设计上就可以使用服务的分层结构。
Since a service provider can do its work by requesting other services, you can use a layered composition of services for your design.
由于服务提供者能够通过请求其他服务来完成自己的工作，在设计上就可以使用服务的分层结构。
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