drill

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

网络解释.电钻；钻；水钻；钻头

词形变化:

复数：drills 复数：drilled 复数：drilled 复数：drilling 复数：drills

派生词: driller

discipline teach practice tool prepare exercise instruct train condition