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祝龙飞1.The four-dimensional space is the space-time composed of countless three-dimensional Spaces along the track of time. Every second and every moment that a person is in is a three-dimensional space. The whole space-time is four-dimensional as time pushes forward2.People in the distant future eat only fruit, are strict vegetarians, and have entered a state of severe mental retardation.3.In the future man will spend all his time in gentle play, bathing in rivers, making love tongue-in-cheek, eating fruit and sleeping.