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人们常说我们的世界是三维的,但是在爱因斯坦的相对论里,我们的世界其实是四维的!这是怎么回事呢?我们一起来探讨探讨吧!
People often say that our world is three dimensional, but in Einstein's theory of relativity, our world is actually four dimensional! What's going on here? Let's talk about it!