pit run material

例句：

1. 1.The mine is using this new type ofpit run material to improve its efficiency.
   这个矿井正在使用这种新型的坑道材料来提高其效率。
2. 2. The engineers were discussing the potentialuses of pit run material inconstruction.
   工程师们正在讨论坑道材料在建筑中的可能用途。
3. 3. The mining companyhas been experimenting with different types ofpit run material to find the best onefor their operations.
   矿业公司一直在尝试不同的坑道材料，以找到最适合他们运营的最佳材料。