trajectory
/ˈtrædʒɪktərɪ/noun
(pl. -ies)
1
- the path described by a projectile flying or an object moving under the action of given forces（抛射体的）弹道, 轨道, 轨迹。
2
- Geometry a curve or surface cutting a family of curves or surfaces at a constant angle【几何】常角轨道, 轨线。
词源
late 17th cent.: from modern Latin trajectoria (feminine)， from Latin traject- 'thrown across'， from the verb traicere, from trans- 'across' + jacere 'to throw'.