They drilled through several layers of rock to reach the oil.他们钻透了几层岩石寻找石油。We had multiplication tables drilled into us at school.以前我们上学得反复背诵乘法表.The recruits drilled regularly.新兵们定时操练....
NOTE: The undersized locator holes are pre - drilled for easy location and assembly.注意: 矮小定位孔预钻孔的位置和便于大会.Leaves after feeding silkworm cocoon silk knot, and then drilled for the moth eclosion cocoon shell.桑蚕取食桑叶后吐丝结茧, 然后...