例句與造句

1. Furthermore, it is included in every bitangent plane.
2. Hirsch extends this argument to " any " surface of revolution generated by a conic, and shows that intersection with a bitangent plane must produce two conics of the same type as the generator when the intersection curve is real.
3. By symmetry, rotations of this plane around the " z " axis give all the bitangent planes through the center . ( There are also horizontal planes tangent to the top and bottom of the torus, each of which gives a  double circle, but not Villarceau circles .)
4. It's difficult to find bitangent plane in a sentence. 用bitangent plane造句挺難的