motion trail的用法和樣例：
例句
- Different branches interact with each other, and can change the motion trajectories of the investigated points.
不同枝條之間存在相互的影響，並能改變考察點的運動軌跡。 - For the purpose of simulating aerodynamically determined body motion, the governing equations of rigid body dynamics are coupled in the overall solution algorithm.
本文還研究了剛體動力學方程與流動方程的耦合求解方法，用於模擬由氣動力決定的物體運動軌跡。
