sand-pileBNC²³⁶²¹³⁺¹ 例句 First, by means of the sand-pile experiment on a slope, it is discovered that self- organized criticality in granular mixtures is strongly influenced by the nonuniform degree of granular material. 首先，进行了不同级配的散粒体沙坡试验，发现散粒体自组织临界性与粒径的非均匀系数有关。 rockmech