轨迹 guǐjì locus
locus; orbit; trajectory; track
怎么记住“轨迹”: 轨 track + 迹 trace = locus.
汉字
用法
- Trajectory / track - the path traced by a moving thing, literal or figurative - 导弹的运行轨迹 (dǎodàn de yùnxíng guǐjì) the missile's flight path.
- Very common figuratively: 人生轨迹 (rénshēng guǐjì) the course/arc of one's life; 发展轨迹 developmental path.
- In math it's the "locus." Focuses on the shape/pattern of a path over time, more abstract than 路线 (a planned route).