Brownian movement

例句：

1. 1.Brownian motion is a type of random movement that occurs in many systems.
   布朗运动是许多系统中发生的随机运动。
2. 2. The Brownian motion of the particles is responsible for their random movement.
   粒子的布朗运动导致了它们的随机运动。
3. 3.The Brownian motion of the particles is a fascinating phenomenon that has been studied by scientists for decades.
   粒子的布朗运动是一个令人着迷的现象，科学家们已经研究了几十年。