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砂石开采,砂石挖掘
gravel extraction
Obtaining a mixture of coarse sand and small water- worn or pounded stones, (used for paths and roads and as an aggregate) from the earth
(从地层中获取粗砂和细小的受水磨蚀或磨碎之石头混合物,通常用作舖设道路的材料。)
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