短语词组短语bit -tooth h dullness 钻头牙齿磨钝度ring bit tooth 环状钻齿bit tooth -row 钻头齿圈tooth bit 钢齿轮钻头Steel Tooth Bit 钢齿牙轮钻头milled tooth bit 铣齿钻头Ball Tooth Bit 球齿钻头ball -tooth bit 球齿钻头 返回 bit tooth