现在从天上再回到地面上，你可知道圆周率控制着弯曲河流的轨迹？ 不管是亚马逊河还是泰晤士河，都被π管得服服帖帖。
Back on Earth, pi controls the path of winding rivers from the Amazon to the Thames.
河流弯弯曲曲地流下山脉。
今天的河流有高高的泥泞岸边、沙洲和弯曲，但很久以前并不是这样的。
Rivers today have high muddy Banks, sandbars and bends. But they didn't always look that way.
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