流体在散体中的随机运动，便形成了一种无序的渗流体系。
A disorderly seepage system is formed as the flowing body undergoes random movement in the bulk system.
显微镜下可见的颗粒的随机运动，是由于在液体或气体环境下许多小而不可见的分子连续碰撞产生的。
Brownian motion the random motion of microscopic particles due to their continuous bombardment by the much smaller and invisible molecules in the surrounding liquid or gas.
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