这个装置目前只能显示一种颜色。但是，科学家们之前已经开发出了刷新率更高的彩色全息显示器。

The system currently works in just one colour. However, the scientists have previously developed colour holographic displays that refresh at a faster rate.

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现在，科学家已经发明了一个小巧的装置，使得观看者能够在不需要特殊眼镜的情况下，看到三维的全息视频。

Now scientists have invented a gadget that allows viewers to watch three dimensional holographic videoes without the need for special glasses.

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一个是能够跟踪观众头部位置的装置，一个是一种新的衍射技术，称之为全息投影。

One is a system that tracks the whereabouts of the audience's heads. The other is a novel diffraction technique, known as holographic projection.

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