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用拇指和食指捏住两枚硬币,然后迅速地来回滑动硬币,你会看到第三枚硬币!为什么?你所看到的一切事物实际上都是物体反射的光。你的眼睛借助光亮在视网
Hold the two coins with your thumb and forefinger, and then quickly slide the coin back and forth. You will see the third coin! Why? Everything you see is actually the light reflected by the object. Your eyes come to light