A key attribute of the cloud computing story is that of self-service: putting the control in the hands of the user, rather than having system administrators perform tasks on behalf of those users.
云计算的一个关键特征是自助服务：将控制权交给用户，而不是让系统管理员代表用户执行任务。
2
The first challenge is to create a system that you can control well enough to perform your computing, and another is to fashion a device that will report the results without damaging the system.
第一个挑战是建立一个稳定可靠的系统去执行计算，另一个是建造一个不会造成系统崩溃的结果报告装置。
3
Computer applications including scientific computing, data processing and information management, automatic control, computer-aided design manufacturing and testing, the system simulation.