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Einstein invented the theory of relativity: People can see things because light shines on things and then reflects into people's eyes. If the sun shines on the clock and then reflects into the person's eyes, and the person moves back at the speed of light, then the light from behind can no longer enter the eye. Then the person's eyes always see the light at a specific moment, so when they see the clock The pointer does not move, but stays at a specific moment. Based on this theory, Einstein proposed the theory of relativity.