目前 ,中国已是电视大国 ,全国居民拥有电视机３亿多台 ,电视观众９亿多人。尤其是在城镇中 ,有线电视普及到千家万户 ,观众普及率更是高得惊人。电视台为了指导观众准时收看节目 ,在全天节目正式播出前（或在每段节目播出前） ,都要预报出每个栏目（节目）的准确播出时间 ,有 At present, China is already a major television nation. Its residents own over 300 million television sets and over 900 million television viewers. Especially in cities and towns, the popularization of cable television reaches every household and the popularization rate of the audience is even more staggering. In order to guide the audience to watch the program on time, the accurate broadcast time of each section (program) should be predicted before the full-time program is officially broadcast (or before each program is broadcasted)