coal pillar for sand proof 防砂煤柱
sand-proof 防风沙
sand proof well 防砂井
sand-proof pillar 防砂煤柱
sand-proof forecasting 防砂预测
helical sand-proof channel 螺旋防砂槽
sand-proof and water diversion 引水防沙
water proof sand paper 水砂纸
·2,447,543篇论文数据，部分数据来源于NoteExpress
Protected against the elements, it is dust and sand proof.
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This is further proof of how volatile sand state real estate still is.
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