Technically, this is not harder to do at the PaaS layer.
从技术上来说，在Paas层这样做并不会更困难。
Modern PaaS should be able to take advantage of services available in the Cloud and their presentation layer should integrate well with Web and mashup technologies.
现代的PaaS应当是能够利用“云”里可用的服务和它们的表现层并且应该能与网站和糅合技术很好的结合。
This layer differs from PaaS in that the virtual hardware is provided without a software stack.
这一层与PaaS的不同之处在于，只提供虚拟硬件，而没有软件栈。
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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