This is a special attachment that sits on top of a standard overhead projector and is attached to a personal computer, making it large enough for easy audience viewing.

它是一种特殊的附带设备，放置在标准高射投影仪上方并和个人电脑连接，它可以放大电脑桌面，使观众看得很清楚。

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The phototube, a very special type of electron tube, is the heart of the talking-picture projector.

光电管，一种非常特殊的电子管，是有声电影放映机的心脏。

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Over the years, we cooperated with many medical care companies, projector manufacturers, movie machinery factories, automobile plants and special lighting plants very well.

多年来，我公司与各个医疗器械厂，投影机厂家，电影机械厂、汽车厂、特种光源厂配套深受好评。

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In order to teach detailed techniques in live demos, we set up a special wired camera connected to a digital light projector.

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