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.
另一个是一种被称之为：全息投影的新奇衍射技术。
The other is a novel diffraction technique known as holographic projection.
另一个是一种被称之为：全息投影的新奇衍射技术。
The other is a novel diffraction technique known as holographic projection.
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