... 圆度 roundness 圆度等级 roundness grade 圆砾 roundstone ...
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All sand grains are quartz sands. Sorting and roundness and sphericity of particles are in good grade-level. Quartz sands are scattered in microcrystalline dolomitic sands in floating state.
岩石中的石英砂分选好，圆度和球度高，它们时稀时密地呈“悬浮”状散布在白云石砂屑沉积物中。
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