利用ns3进行网络仿真 有线网与无线网之间网桥模拟-Use ns3 be simulated bridge between the wired network and wireless network simulation network

对NS3中源码third.cc进行注释。third.cc是一个实现无线，点对点，csma网络之间进行通信-NS3 third.cc for annotating the source. third.cc is an implementation of communication between the wireless, point to point, csma network

ns3蜂窝无线网络针对mac层的仿真，用于对吞吐量延迟性能进行分析。对于新手有一定的参考价值-Ns3 cellular wireless network for mac layer simulation, used to analyze the throughput delay performance. For the novice have some reference value