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1. It cuts a clean cylinder of rock, from which can be seen the strata the drill has been cutting through.
    它切割出一块表面光滑的圆柱体石头, 从这石块上可以看出钻头在切割的岩层.

2. It cuts a clean cylinder of rock, from which can be seen the strata the drill has been cutting through.
    这种钻头能切割一段光滑的圆柱形岩石,从中能看出所钻透的地层。