说明：  这是Network Simulator 2的使用指南，NS2是进行网络开发的重要工具，通过NS的模拟，可以花极小的代价来验证所开发的算法的效果
(This is the Network Simulator 2 User Guide, NS2 is an important tool for network development, through NS simulation, you can spend a very small price to verify the algorithm developed by the effect of)