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数学强迫症：如何将面包圈切割成环扣的两半 (25) share digg
by steen (37) on 煎蛋 (128) 2 months ago permalink
- jungle said: 我想到Klein bottle了...
- RaRo said: geeks-tip
- anakin said: 可以一试
- Lovecraft said: 第一反应就是莫比乌斯环
- Jiajun said: 哇！厉害
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