n.操练；钻头；军事训练；（应对紧急情况的）演习vt.& vi.钻（孔）；打（眼）；操练；训练vt.作…演习，操练； 变形： 复数：drills过去式：drilled过去分词：drilled现在分词：drilling第三人称单数：drills 双语释义：n.(名词)[C]钻头,钻床 a tool or machine for making holes[U]操练,训练 training and instruction in a subject of for a purpose, especially by