从侧面不同角度切割圆锥，你便会得到不同的椭圆，直到你的切割角度超过圆锥体侧边的角度。
Cutting the cone at various angles gives you various shapes of ellipse. Until the angle 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。
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.
将复式刀架盘旋转一个等于圆锥体顶角一半的角度。通过摇动复式刀架操纵柄手动提供进给。
Rotating the disc of the compound rest with an angle equal to half the apex angle of the cone.
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