精选优质文档-倾情为你奉上最牛英语口语培训模式：躺在家里练口语，全程外教一对一，三个月畅谈无阻！ 洛基英语，免费体验全部在线一对一课程：（报名网址）Videoconferencing is nothing more than a television set or PC monitor with a camera Through the videocenferencing, not only your voice but also your face, the surroundings and any other graphic and phisical _1_ can be captured and transmitted through the communication system with or without wires. Of course, when you go into the details, the technology involved is very _2_ and the subject matter littered wi
