A real or virtual photon may spontaneously annihilate.

一个实的或虚的光子可以自发地湮没。

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His works present subtle texture and flavor, mixed with real or virtual musical rhyme.

最终作品呈现出微妙的质地和气息，也富于虚实交错的音乐韵动。

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Whether you plan a real or virtual trip overseas, learn more about how to travel beyond U.S. borders.

不管你在准备一次海外的实际旅行还是虚拟旅行，了解更多境外游信息。 这项活动能整合关于安全和花费问题的所有想法。

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The rules don't apply to individuals who simply use virtual currencies to purchase real or virtual goods.

WSJ: Bitcoin Virtual Cash Gets Money-Laundering Rule

With its full head and motion tracking support, the technology is a milestone for real-time gaze interaction with virtual avatars or 3D gaming applications.

ENGADGET: SMI Eye-Tracking 3D Glasses use rim-based cameras to adjust perspective

"We are very interested in music where you have real instruments on stage and virtual sound sources, which can be coming directly from the computer or transformed from the real-time recording of instruments onstage, " he says.

NPR: IRCAM: The Quiet House Of Sound