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简介：天地万物的大小，相差很悬殊，从庞大的太阳系到浩瀚的银河系，一直到广袤无垠的宇宙；而分子和原子，又极其渺小。从难以置信的庞大，到不可思议的渺小，宇宙万物的尺寸有天壤之别。就算你自认为了解大小是怎么一回事，以下内容也会让你大开眼界……收起
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