求翻译：颗粒物质是地球上存在最多的物质之一，比如河流中的泥沙、泥石流、沙子等，近年来颗粒物质的研究已经非常活跃。大量的颗粒物质组成的离散物质体系有其自身的运动规律，这些运动规律不同于固体、液体以及气体的运动规律。本文中综述了颗粒的物质的主要特性，所研究的颗粒为松软、均匀的细沙，基于离散元的原理，对软沙颗粒进行相关的计算和分析，并得出结论。是什么意思？

Particulate matter is one of the largest on Earth material, such as sediment in the rivers, landslides, sand, etc., in recent years particulate matter has been very active. A lot of particulate matter composed of discrete material system has its own law of motion, law of motion is different from the

It is particulate matter exists on the earth up to one of the substances, such as in the river of mud and sand, mud, sand, fine particulate matter research in recent years has been very active. A lot of particulate matter formed system of discrete substances have their own rules of movement, the mov

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Particulate matter is one of the most substances on the planet, such as sediment and debris flow in the River, such as sand, study of particulate matter have been very active in recent years. Large amounts of particulate matter made up of discrete material system has its own motion, the motion is di