fraction silt
分数淤泥
以上为机器翻译结果，长、整句建议使用 人工翻译 。
And the sand ripples on the surface arise obviously with the increasing silt mass fraction and wind speed, but disappear as silt mass fraction exceeds 15%.
实验中沙波纹的高度和波长随风速及粉粒的质量分数的增大而增大，而当粉粒的质量分数超过15%时沙波纹消失。
youdao
The cassiterite makes up some fraction of the standard sand and river silt there.
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