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Back on Earth, pi controls the path of winding rivers from the Amazon to the Thames. 現(xiàn)在從天上再?gòu)h到地麪上,你可知道圓周率控制著彎曲河流的軌跡? 不琯是亞馬遜河還是泰晤士河,都被π琯得服服帖帖。