从很多方面讲，公用云就是主机托管供应商和IS P购买很多服务器并由此产生出的利润丰厚的外包服务器行业的产物。
In many ways, the public cloud is an outgrowth of large colocation providers and ISPs buying up servers and creating a lucrative outsourced server industry.
虚拟网络提供给用户普通的LAN一样的网络，其中服务器位于物理数据中心(虚拟化或未虚拟化)、私有云以及公用云。
A virtual network gives a customer a common LAN-like network where the servers can be located in the physical data center (virtualized or not), private cloud, and public cloud.
如果有所谓的标准答案的话，云计算并不是一种必须安装、不断维护的产品，而是一种犹如公用设施般，可供随时利用的服务。
If there is a standard definition, it involves computing that is not so much a product you have to install and maintain but a service you tap into like a utility.
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