・この動画「

欧拉螺线(Euler spiral

」@bilibili.comと
　　↓↓↓一緒に視聴されています(Often Viewed With)：↓↓↓

・三体运动
・数学之王“欧拉”的数学成就，欧拉恒等式，数学里最优美的公式。
・用几何图形表示数学概念。
・正2.5边形居然长这样？！
・为啥球体比平面多一个点？球极投影给你答案。

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