You may be called on to present using no equipment or you may have a whiteboard slide projector overhead projector or beam projector available.

你也许会被叫去做演讲而不用任何设备，也可能会准备一块白板、幻灯机或投影仪。

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In each classroom there is a computer, an overhead projector, and a smart white board.

每个教室里都有一台电脑、一台投影仪和一块智能白板。

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I counted four computers in the back of the room, an ink-jet printer, and an overhead projector that looked to be at least 15 years old.

我在教室后面发现四台计算机，一台喷墨打印机，还有一个至少用了15年的投影仪。

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As the advanced-placement economics students file into Room 339 at Stuyvesant High School in Lower Manhattan, Clarissa Bushman displays a graph on the overhead projector.

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The important thing is to back those points up, with another visual aid, even something as simple as hand illustrating your points on a white board or overhead projector.

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The Buhl Industries Mark IV Opus Opaque Overhead Projector.

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