But as an analogy, when people were trying to understand the Solar System with algebra and geometry, they could only describe the planets' orbits.
但是打个比方，当人们试图利用代数和几何来理解太阳系的时候，他们只能够说明这些行星的轨道。
But even if we try to discover the unknown world, our memory either continues to float in the unknown world or remains as an analogy.
但是，即使我们设法去发现那个未知的世界，我们的记忆既会在那个未知的世界浮现，也会如同比喻般保留。
In the ball analogy, the radius of the ball grows as the universe expands, but all points on the surface of the ball (the universe) recede from each other in an identical fashion.
和球类似，随着球的半径增长(正如宇宙膨胀)，球(宇宙)表面的任意点都以同样方式与其他点远离。
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