说明：  这是与计算的最新资料，对计算机专业的学生很有帮助，　云计算是继1980年代大型计算机到客户端-服务器的大转变之后的又一种巨变。 这是一种时代的导向
(This is the latest information and computing, computer science students is helpful, cloud computing is a sea change after a big change in the 1980s mainframe computers to client- server' s. This is an age-oriented)