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时间是什么?对常人而言,时间是钟表的滴答,生命的步伐,这难道还是问题吗?但在科学家面前,这可是科学中的重大问题。
What time is it? For the average person, time is the ticking of clocks, the pace of life, is this still a problem? But in front of scientists, this is a major issue in science.