directionlessadj.无方向的；无目标的directionn.方向；指导；用法说明；趋势；目标；管理direction of welding焊接方位,焊接方向direction of tension牵引方向directional antennas定向天线direction of winding绕线方向Directional hlasting定向爆破Direction of writing论文指导directional strategy导向策略directional relation方向关系directional lighting方向性照明,定向照明定向照明,定向照明directional focusing指向聚焦