the movement without any regular pattern made by very small pieces of matter in a liquid or gas 布朗运动（流体中悬浮颗粒所做的不规则运动） This slide shows how Brownian motion appears through a microscope. 此幻灯片显示了如何通过显微镜显示布朗运动。 The mathematics behind Brownian motion was applied to stock market fluctuations. 布朗运动背后的数学被应用于股票市场的波动。