particles fraction

• 颗粒组成

particles fraction的用法和样例：

例句

1. The aggregates, composed of the primary particles, retain sufficient water and nutrients.
   由原颗粒组成的团聚体要能保持充分的水分和养分。
2. The base surge of dirt particles moves outward from the center of the explosion and is subsequently carried downwind.
   由尘埃颗粒组成的基浪从爆炸中心向外移动，继而顺风散开。