说明：  Omnet的用户手册中文版.适合没接触过Omnet的初学者,从搭建一个简单的模型开始.简单模块和复合模块的结构介绍.
(Use document, the Chinese version of Omnet suitable for did not contact Omnet beginner, start from to build a simple model to structure of simple modules and compound modules.)