borehole-surface variant

例句：

1. 1.The borehole-surface variant of therock is different from the original rock.
   这种岩石的井眼表面变种与原始岩石不同。
2. 2. The borehole-surface varianthas been studied for its potential applications inoil exploration.
   这种岩石的井眼表面变种已被研究，以探索其潜在的应用价值。
3. 3. The borehole-surface variantwas discovered during the drilling process.
   这种岩石的井眼表面变种是在钻探过程中发现的。