/drɪl ||; drɪl/noun1 [C] a tool or machine that is used for making holes in things 钻;钻机: a dentist's drill 牙钻 ☞picture at tool 见tool插图
2 [U] exercise in marching, etc that soldiers do (士兵的)操练
3 [C] something that you repeat many times in order to learn sth 练习
4 [C,U] practice for what you should do in an emergency (应付紧急情况的)演习: a fire drill 消防演习