One of the key tenets of the Cloud is Elasticity, which is the ability to scale out and scale down on demand.

云的重要原则之一就是伸缩性，它可以按照客户需求提供资源。

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Elasticity in a system or component of a system (I'll use software as an example, since I work with IBM WebSphere eXtreme Scale every day) implies three specific degrees of freedom

系统或系统组件中的弹性（我将以软件为例，因为我每天都与 IBM WebSphere eXtreme Scale 打交道）暗示三种特定的自由程度

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Based on above results, the comparison on the return to scale and output elasticity that DEA and the parametric approach offer is presented.

并依据上述结果，比较分析了DEA方法和参数方法在生产规模报酬率和产出弹性测量方面的差异。

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Wholesale storage providers like Amazon S3, or value-added providers of content storage, like Box.net, have proven they can offer scale and elasticity unmatched by on-premise infrastructure.

FORBES: With Apple's Endorsement, Cloud Storage Finally Comes Of Age