v (1) 钻，凿，挖(make (a hole， well， tunnel， etc) by using a drill or by digging)[I， I+prep， T+n， T+n+prep]：～through rock凿岩洞;～a well 挖井;～a hole(in wood/a wall/the side of a ship)(在木头/墙/船舷上)钻洞;～a tunnel(through a mountain/under the sea)(穿山/在海底)凿隧道; 〖同〗drill;

(2) 掘洞前进(move by digging)[I+prep， I+adv， T+n+prep， T+n+adv]：(mole)～(its way) underground (鼹鼠)在地下钻行;

(3) 艰难地行进(move steadily ahead， usu through difficulties)[I+prep(through)， T+n+adv(through)]：～on through waves破浪而行;～one's way through a crowd of people在人群中挤行;

→′borer n 钻孔者，钻孔的工具;′borehole n 钻孔;

n (1) 钻孔(deep hole made by drilling into the ground (esp for oil or water))[C] (=borehole);

(2)枪炮的口径(distance across the hollow inside of a gun barrel)[C](尤用于合成词)：small-～guns 小口径步枪;a twelve-～shotgun 12毫米口径猎枪