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What is virtual reality?. ??? ?? ???? ??? ??? ????? ?? ?. ????? ???? ???? ??? ?? ?? ??? ??, ??, ??, ??, ?? ?? ???? ???? ????? ???? ????? ??? ?? ?? ?. Feedback system? ??. . Many forms of VR. . . ??? VR(immersive VR) ??????(Reality Engine) H.M.D (Head-Mounted Visual Display)
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