说明：  OPNET 是目前网络仿真工具中的很好的一个，但是由于操作复杂，使用者一般需要半年或以上时间的培训和自行研究才能熟练地掌握。针对这个问题，本书基于对OPNET 软件的研究，由浅入深地介绍 了用其进行通信仿真系统建模的整个过程。
(OPNET network simulation tool is a good one, but due to complicated to operate, users generally need six months or more hours of training and self-study to proficiency. To address this issue, the book based on OPNET software research, progressive approach to description of the simulation system to communicate with the entire modeling process.)