Title Text:I think I could spend hours just stepping on and off of conveyor belts moving at various speeds.<
Origin:https://xkcd.com/1175/
https://www.explainxkcd.com/wiki/index.php/1175:_Moving_Sidewalks
自动人行道
https://www.douban.com/photos/photo/1876909138/
Cueball和Megan正准备骑一系列迷你传送带，每个传送带的速度都是第一个传送带的倍数。假设他们都拿着它们前面的那个，每个传送带会稍微加速它们，只需要很少的努力，最终达到一个非常快的速度并且足够接近高五彼此。
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