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sand extraction
desert.	沙石开采
tech.	砂提取; 砂石开采
sand extraction The extraction of sand by mining for building purposes and for the extraction of heavy minerals such as rutile and zircon
environ.	沙石开采 (为了建筑使用的矿物和获得重金属例如金红石和锆石而开采沙子。)

sand extraction: 1 phrase in 1 subject

Ecology

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