noun, adjective · the course of development or the progression of a person's life or a historical event

每个人的成长轨迹都是独一无二的。

noun · the physical path followed by a moving object, projectile, or celestial body

这颗彗星的运行轨迹非常特殊。

noun · a set of points whose location satisfies or is determined by specific mathematical conditions

圆是平面上到定点距离等于定长的点的轨迹。