中粒的 meaning in English

medium-grained
medium-granular
mesograined

The correlation between ultrasonic attenuation and particle size distribution was given by combining experiments with data analysis , and an inverse parameters optimization method , genetic algorithm , was applied for particle size distribution
将所推导的模型结合实验和数据分析以确定超声波衰减与粒度分布的关系，且采用遗传算法反演计算获得矿浆中粒的粒度分布。