Modern media of teaching mainly refers to the video media-the media of printing, slide, projection, video and computer.
现代教学媒体主要指的是视听媒体，即印刷媒体、录音媒体、幻灯媒体、投影媒体、录像媒体、计算机媒体。
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Plate projection system: a plat exposure system which works by projecting the image from microfilm or compact roll film rather than by the same-size one-to-one contact printing of films.