公开云通常是指软件即服务（SaaS）应用，像是Salesforce.com所提供的，还有基础设施即服务（IaaS），像亚马逊网络服务（AWS）。
Public clouds generally refer to software-as-a-service (SaaS) apps like those provided by Salesforce.com and infrastructure-as-a-service (IaaS) platforms like Amazon Web Services.
在云计算和能源方面，也许是出于竞争力方面的考虑，几乎没有企业愿意公开自己的总能源消耗和排放。
When it comes to cloud computing and energy, though, few companies appear willing to publish their total energy consumption or emissions, perhaps for competitive reasons.
你可以在某个适当的设施中运行自己的私有云，从而在进入公开的大型云计算环境之前，获得一定的安全保护。
You can run your private cloud in a co-location facility which will give you some of the protection of being in the larger, public cloud.
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