The system is decoupled from the underlying infrastructure and therefore easy to get running within any IaaS layer.
由于系统与底层基础设施间的连接是松耦合的，所以它能轻易地运行在任意IaaS层之上。
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。
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。
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