... THECONCEITEDAPPLE-BRANCH奇异的苹果枝 THECONE圆锥 THECOUNTRYOFTHEBLIND盲者之乡 ...
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Cutting thecone at various angles gives you various shapes of ellipse. Until theangle of your cut exceeds the angle of the side of the cone.
如果你从侧面不同角度切割圆锥,便会有不同样子的椭圆,除非,直到你的切割角度超过圆锥体侧边的角度。
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