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.

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。

youdao

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。

youdao

So as long as the angle of the cut comes shortof the angle of the cone's side it is an ellipse.

所以，只要你切割的角度达不到圆锥侧边的角度，它依然是椭圆。

youdao

And just to give you a sense, if you do a cross-cut of this, you cannot show it from this angle, but it should really be sort of a dumbbell shape with the nodal plane in between the two nuclei.

告诉你们这些就是给你们点概念，假如你们把他横切切开，不能从角度上展示，但它还是会保留几分哑铃的形态,以及在两核之间的节面。

麻省理工公开课 - 固态化学导论课程节选

Russell and Xu's method starts with a sliced crystal, either sapphire or silicon, cut at an angle that exposes a ragged section of the crystal's lattice structure.

FORBES: Nanotech

Inevitably, he bowled some short balls and was cut and he was also worked off his pads because of the angle.

BBC: Jonathan Agnew column