An Approach to the Progress and Improvement in Proofreading Function

To research the proofreading function from the historical viewpoint,it is easily discovered that proofreading before 1980's is primarily ″proofreading differences″,but with the development of the technology in computer network,the technology of laser typesetting,proofreading function has been changed from″proofreading differences″to″proofreading right from wrong″.