The shape irregularity of sand grains leads to eccentric distances in grains, and their variant positions when they begin to move results in the diversity of eccentric angle.

沙粒形状的不规则性使得沙粒的质心存在着偏心距，且沙粒所处位置的不同使其偏心角各异。

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The shape irregularity of sand grains leads to eccentric distances in grains, and their variant positions when they begin to move results in the diversity of eccentric angle.

沙粒形状的不规则性使得沙粒的质心存在着偏心距，且沙粒所处位置的不同使其偏心角各异。

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