力的分析表明，在粘性介质中存在一对方向相反的阻力和拉力作用于微颗粒。
Force analysis reveals that there are drag and trapping forces imposed on the bead in the opposite directions, respectively, in a viscous medium.
为了应用概率统计规律解决机械阻力问题，分析了颗粒碰撞过程及相对距离、颗粒个数及碰撞方向。
This paper tries to resolve the problem of mechanical drag force by the rule of probability and statistics.
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