长难句：Comparisons were drawn between the development of television in the 20th century and the diffusion of printing in the 15th and 16th centuries.
结构剖析：本句的主干是 Comparisons were drawn between ... and ..., 难点在于使用了被动语态，理解时可以转换成主动语态： People drew comparisons between ... and ... (人们对.... 与.... 进行了一些比较)。
核心词汇： comparison 比较
diffusion 传播;扩散
参考译文：人们对20世纪电视业的发展与15、16世纪印刷术的传播进行了一些比较。