说明：  鉴于很多云计算爱好者想学习云计算但不知道如何入手，中云网云计算专家提醒云计算爱好者关注以下三个开源的云计算项目，接触开源的东西能够更好更快的掌握云计算。
(As many fans would like to study cloud computing cloud computing but do not know how to start, Zhongyun cloud computing experts have warned that cloud computing enthusiasts focus on the following three open source cloud computing projects, access to open source something better and faster control Cloud computing.)