... 粒度分布曲线：grain-size distribution curve 粒度递变沉积：graded sediment 粒度变异：granular variation ...
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Non-graded sediment 不均粒沈积
broad graded sediment 宽级配泥沙
graded sediment incipient velocity 分级起动流速
graded coarse sediment 级配粗泥沙
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It is characteristic of rapid sediment reverse graded structure.
具有快速堆积的逆向粒序构造特征。
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