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

1. trained in a skill by repetitious practice

    e.g. well-drilled in military procedures