river gravel
河砾石
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河岸砾石 band-run gravel
河流砾石浅滩 bar gravel
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拦河主坝坝壳以当地材料砂砾石为主，防渗心墙比较了粘土心墙、沥青混凝土心墙和斜墙型式。
The material of the main dam shuck is mainly the local sandy gravel. The clay core and the asphalt concrete core were compared in the choosing of seepage prevention type.
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