Authors use the mainstream network simulation tool NS2 in teaching network, set up a simulation model to discuss the network topology and the method of simulation parameters selection.
该文使用主流网络仿真工具NS 2对教学实验网络建立了仿真模型，讨论了网络拓扑结构和仿真参数的选取方法。
Virtual learning environment is the simulation of teaching method, thinking model, cognition manner and control means in the actual learning environment.
虚拟现实的学习环境是对现实教学方法、思维方式。、感知行为和控制手段等的模拟。
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