n.

1. 【物】軌道；彈道；軌跡
   Before falling into the hoop, the basketball traveled a perfect trajectory.

   在掉入籃框之前，籃球走過一道完美的軌跡。

2. 【數】軌線；常角軌道

n.

1. the path described by a projectile flying or an object moving under the action of given forces.
2. Geometry  a curve or surface cutting a family of curves or surfaces at a constant angle.