人类现已走入二十一世纪,报纸、广播、电视、网络成为目前存在的四大媒体。有目共睹的是,传统媒体即报纸、广播、电视受到了第四种媒体——网络的强有力的威胁和挑战。 有人预言:“第四种媒本会实现人类传播史上的又一次革命”。此外,还有一个不争的事实,即二十世纪的科技发展突飞猛进。可以预见二十一世纪科技的发展更值得大书特书。从今往后,人们不 Humanity has now entered the 21st century. Newspapers, radio, television and the Internet have become the four major media currently in existence. What is clear is that the traditional media, newspapers, radio and television, have been threatened and challenged by the fourth media-network. Some people predict: “The fourth media will realize another revolution in the history of human communication.” In addition, there is an indisputable fact that the development of science and technology in the twentieth century has progressed by leaps and bounds. It is foreseeable that the development of science and technology in the 21st century is even more deserving of special books. From now on, people do not