第三人称单数：数：drills
第三人称单数：drills
现在分词：：drilling
操练；钻( drill的过去式和过去分词 )；打；训练；
1. 钻过孔的：drilled oil ring 钻孔刮油环 | drilled 钻过孔的 | driller 钻床
2. 钻孔的：drill speed;钻孔速度 | drilled;钻孔的 | drilled bar;钻有孔的杆
drilled
adj
1. trained in a skill by repetitious practice
e.g. well-drilled in military procedures
