Service Layer providing cloud services. IaaS is considered a service providing infrastructure along with PaaS offering middleware and SaaS providing applications.
服务层，提供云服务，如IaaS提供基础设施服务，PaaS提供中间件服务，SaaS提供应用服务。
The middleware layer can be thought of as a pure service layer.
中间件层可以被认为是一个纯粹的服务层。
The middleware layer can be thought of as a pure service layer.
中间件层可以被认为是一个纯粹的服务层。
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