世界跆拳道协会与新加坡科技游戏公司 Refract Technologies 携手，共同打造虚拟跆拳道，让即使没有实际身体接触的人也能体验到激烈的对练。 Refract ...

When light travels from air into a denser medium like water or glass, it will refract towards the normal. When light travels from a denser medium into air, it will refract away from the normal.

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