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 detection方向检测direction of travel走行方向directional sorting定向排序direction constancy方向恒常性directional mapping定向映射, 定向映象directional element方向元件directional receiver接收定向信号的接收机,定向信号接收机,定向接收机directional complete趋向补语directional blasting定向爆破directional counters定向计数器