bench gravel ; terrace gravel
阶地砾石
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砾石阶地 gravel terrace
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上述阶地、沙嘴和湖岸堤的沉积物主要由磨圆度和分选性较好的砂或砂砾石组成。
The land spit and lake terrace are formed by the sand and grit which have good polish and select.
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