random motion

例句：

1. 1. The random motion of the particles caused the light to spread out evenly.
   粒子的随机运动使得光均匀扩散。
2. 2.The scientist observed that the random motion of the molecules led to the formation of a new compound.
   科学家观察到分子的随机运动导致了新化合物的形成。
3. 3. In the movie, the random motion of the characters was used to create suspense and tension.
   电影中，角色的随机运动被用来创造悬念和紧张感。