blunt bitdull bitdullbit钝: blunt; dull钻头: boring crown; bore bit; dril ...磨钝钻头: dulled bit; worn bit钝钻: blunt drill钻头: boring crown; bore bit; drilling bit; [机械工程] bit (of a drill) 三牙轮钻头 three cone bit; 卸下钻头 break out a bit; 装上钻头 brace a bit下载手机词典可随时随地查词查翻译