Due to its excessive dependence on the web server, the traditional online foreign-language-teaching system based on the C/S (Client/Server) model, has its born disadvantages and is unable to break through the limitations of server capability and bandwidth. The new online teaching system, which adopts P2P (Peer-to-Peer) technique and streaming media technique, can make full use of the bandwidth and hardware resources of every online node and achieve a synchronous communication and file sharing among the students or between the teacher and th...