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云计算是时下十分热门的概念．它到底是个什么好东东呢？以下Gartner给出的定义已经成为经典而被大量引用：＂Cloud computing is ＂a style of computing where massively scalable IT-related capabilities are provided ＇as a service＇ across the Internet to multiple external customers using Intemet technologies.＂即，