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1.These will be provided some valuable references to control the weathering and erosion of rock slope in engineering.
这些将为工程上治理岩石边坡的风化与侵蚀作用提供有价值的参考。收藏指正
2.Worthless rock or other material in which valuable minerals are found.
矿物杂质，尾矿在其中找到有价值的矿石的无价值岩石或其它矿产收藏指正
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