a steel rock drill with a star-shaped point that is used for making holes in stones or masonry; it is operated by hitting the end with a hammer while rotating it between blows
权威例句
1.
There is always some star player coming off an injury, testing himself in minor drills while a gaggle of reporters, cameramen and team officials breathlessly watch.
WSJ: Johan Santana Watch: As Mets Camp Opens, All Eyes on the Team's Ace